388366640 has 40 divisors (see below), whose sum is σ = 922173120. Its totient is φ = 152039936.

The previous prime is 388366619. The next prime is 388366651. The reversal of 388366640 is 46663883.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 388366591 and 388366600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47885 + ... + 55404.

It is an arithmetic number, because the mean of its divisors is an integer number (23054328).

Almost surely, 2^388366640 is an apocalyptic number.

It is an amenable number.

388366640 is an abundant number, since it is smaller than the sum of its proper divisors (533806480).

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

388366640 is a wasteful number, since it uses less digits than its factorization.

388366640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103349 (or 103343 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 44.

The square root of 388366640 is about 19707.0200690008. The cubic root of 388366640 is about 729.5929675601.

The spelling of 388366640 in words is "three hundred eighty-eight million, three hundred sixty-six thousand, six hundred forty".