388731240 has 48 divisors (see below), whose sum is σ = 1263377700. Its totient is φ = 103661568.

The previous prime is 388731221. The next prime is 388731269. The reversal of 388731240 is 42137883.

388731240 is a `hidden beast` number, since 388 + 7 + 31 + 240 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 371641284 + 17089956 = 19278^2 + 4134^2 .

It is a super-2 number, since 2×388731240² = 302223953903875200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 388731195 and 388731204.

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, 539545 + ... + 540264.

Almost surely, 2^388731240 is an apocalyptic number.

388731240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

388731240 is an abundant number, since it is smaller than the sum of its proper divisors (874646460).

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

388731240 is a wasteful number, since it uses less digits than its factorization.

388731240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079826 (or 1079819 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 388731240 is about 19716.2684096154. The cubic root of 388731240 is about 729.8212109847.

The spelling of 388731240 in words is "three hundred eighty-eight million, seven hundred thirty-one thousand, two hundred forty".