388744992 has 36 divisors (see below), whose sum is σ = 1105494390. Its totient is φ = 129581568.

The previous prime is 388744981. The next prime is 388745003. The reversal of 388744992 is 299447883.

388744992 is a `hidden beast` number, since 3 + 88 + 74 + 499 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (388744981) and next prime (388745003).

It can be written as a sum of positive squares in only one way, i.e., 388720656 + 24336 = 19716^2 + 156^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×388744992² = 302245337610160128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 674617 + ... + 675192.

Almost surely, 2^388744992 is an apocalyptic number.

388744992 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

388744992 is an abundant number, since it is smaller than the sum of its proper divisors (716749398).

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

388744992 is a wasteful number, since it uses less digits than its factorization.

388744992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349825 (or 1349814 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 388744992 is about 19716.6171540658. The cubic root of 388744992 is about 729.8298170874.

The spelling of 388744992 in words is "three hundred eighty-eight million, seven hundred forty-four thousand, nine hundred ninety-two".