388264690 has 32 divisors (see below), whose sum is σ = 763426944. Its totient is φ = 140999040.

The previous prime is 388264661. The next prime is 388264727. The reversal of 388264690 is 96462883.

It is a happy number.

It is a super-2 number, since 2×388264690² = 301498939001592200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 388264690.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101187 + ... + 104953.

It is an arithmetic number, because the mean of its divisors is an integer number (23857092).

Almost surely, 2^388264690 is an apocalyptic number.

388264690 is a deficient number, since it is larger than the sum of its proper divisors (375162254).

388264690 is a wasteful number, since it uses less digits than its factorization.

388264690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4722.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 388264690 is about 19704.4332575185. The cubic root of 388264690 is about 729.5291202356.

The spelling of 388264690 in words is "three hundred eighty-eight million, two hundred sixty-four thousand, six hundred ninety".