388721146 has 16 divisors (see below), whose sum is σ = 646872480. Its totient is φ = 173696080.

The previous prime is 388721143. The next prime is 388721173. The reversal of 388721146 is 641127883.

It is a super-2 number, since 2×388721146² = 302208258695106632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 388721099 and 388721108.

It is not an unprimeable number, because it can be changed into a prime (388721143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148441 + ... + 151036.

It is an arithmetic number, because the mean of its divisors is an integer number (40429530).

Almost surely, 2^388721146 is an apocalyptic number.

388721146 is a deficient number, since it is larger than the sum of its proper divisors (258151334).

388721146 is a wasteful number, since it uses less digits than its factorization.

388721146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299549.

The product of its digits is 64512, while the sum is 40.

The square root of 388721146 is about 19716.0124264518. The cubic root of 388721146 is about 729.8148939561.

The spelling of 388721146 in words is "three hundred eighty-eight million, seven hundred twenty-one thousand, one hundred forty-six".