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1999887413 = 3803525871
BaseRepresentation
bin111011100110011…
…1101110000110101
312011101010210210012
41313030331300311
513043432344123
6530240310005
7100362522356
oct16714756065
95141123705
101999887413
11936980017
12479912305
1325b438044
1414d869d2d
15ba88e378
hex7733dc35

1999887413 has 4 divisors (see below), whose sum is σ = 2000417088. Its totient is φ = 1999357740.

The previous prime is 1999887401. The next prime is 1999887433. The reversal of 1999887413 is 3147889991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1999887413 - 212 = 1999883317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999887433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259133 + ... + 266738.

It is an arithmetic number, because the mean of its divisors is an integer number (500104272).

Almost surely, 21999887413 is an apocalyptic number.

It is an amenable number.

1999887413 is a deficient number, since it is larger than the sum of its proper divisors (529675).

1999887413 is an equidigital number, since it uses as much as digits as its factorization.

1999887413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529674.

The product of its digits is 3919104, while the sum is 59.

The square root of 1999887413 is about 44720.1007713534. The cubic root of 1999887413 is about 1259.8974076627.

The spelling of 1999887413 in words is "one billion, nine hundred ninety-nine million, eight hundred eighty-seven thousand, four hundred thirteen".

Divisors: 1 3803 525871 1999887413