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1999255284 = 2235131741227
BaseRepresentation
bin111011100101010…
…0011011011110100
312011022221200200000
41313022203123310
513043302132114
6530214551300
7100354250415
oct16712433364
95138850600
101999255284
119365890a4
12479668530
1325b2763c0
1414d74380c
15ba7b6e09
hex772a36f4

1999255284 has 288 divisors, whose sum is σ = 6148711296. Its totient is φ = 562360320.

The previous prime is 1999255231. The next prime is 1999255337. The reversal of 1999255284 is 4825529991.

1999255284 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 2 + 552 + 84 = 666.

It is an interprime number because it is at equal distance from previous prime (1999255231) and next prime (1999255337).

It is a Harshad number since it is a multiple of its sum of digits (54).

1999255284 is a modest number, since divided by 55284 gives 19992 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1999255284.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8807179 + ... + 8807405.

It is an arithmetic number, because the mean of its divisors is an integer number (21349692).

Almost surely, 21999255284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999255284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3074355648).

1999255284 is an abundant number, since it is smaller than the sum of its proper divisors (4149456012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999255284 is a wasteful number, since it uses less digits than its factorization.

1999255284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 303 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The square root of 1999255284 is about 44713.0325967721. The cubic root of 1999255284 is about 1259.7646499202.

It can be divided in two parts, 199925 and 5284, that added together give a square (205209 = 4532).

The spelling of 1999255284 in words is "one billion, nine hundred ninety-nine million, two hundred fifty-five thousand, two hundred eighty-four".