19932494400 has 1512 divisors, whose sum is σ = 92630649384. Its totient is φ = 4025548800.

The previous prime is 19932494399. The next prime is 19932494411. The reversal of 19932494400 is 449423991.

19932494400 is a `hidden beast` number, since 1 + 99 + 32 + 494 + 40 + 0 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 12182861376 + 7749633024 = 110376^2 + 88032^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 376084774 + ... + 376084826.

It is an arithmetic number, because the mean of its divisors is an integer number (61263657).

Almost surely, 2^19932494400 is an apocalyptic number.

19932494400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19932494400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46315324692).

19932494400 is an abundant number, since it is smaller than the sum of its proper divisors (72698154984).

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

19932494400 is a wasteful number, since it uses less digits than its factorization.

19932494400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 19932494400 in words is "nineteen billion, nine hundred thirty-two million, four hundred ninety-four thousand, four hundred".