1999629450 has 384 divisors, whose sum is σ = 6964554240. Its totient is φ = 410572800.

The previous prime is 1999629433. The next prime is 1999629481. The reversal of 1999629450 is 549269991.

1999629450 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 629 + 4 + 5 + 0 = 666.

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

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 5036652 + ... + 5037048.

It is an arithmetic number, because the mean of its divisors is an integer number (18136860).

Almost surely, 2^1999629450 is an apocalyptic number.

1999629450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999629450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3482277120).

1999629450 is an abundant number, since it is smaller than the sum of its proper divisors (4964924790).

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

1999629450 is a wasteful number, since it uses less digits than its factorization.

1999629450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The square root of 1999629450 is about 44717.2164831399. The cubic root of 1999629450 is about 1259.8432344648.

It can be divided in two parts, 199962 and 9450, that multiplied together give a square (1889640900 = 43470²).

The spelling of 1999629450 in words is "one billion, nine hundred ninety-nine million, six hundred twenty-nine thousand, four hundred fifty".