38992121856 has 156 divisors (see below), whose sum is σ = 114318445072. Its totient is φ = 12802572288.

The previous prime is 38992121843. The next prime is 38992121899. The reversal of 38992121856 is 65812129983.

38992121856 is a `hidden beast` number, since 389 + 92 + 121 + 8 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2461995 + ... + 2477781.

Almost surely, 2^38992121856 is an apocalyptic number.

38992121856 is a gapful number since it is divisible by the number (36) 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 38992121856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57159222536).

38992121856 is an abundant number, since it is smaller than the sum of its proper divisors (75326323216).

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

38992121856 is a wasteful number, since it uses less digits than its factorization.

38992121856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15884 (or 15859 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 38992121856 in words is "thirty-eight billion, nine hundred ninety-two million, one hundred twenty-one thousand, eight hundred fifty-six".