388330857 has 6 divisors (see below), whose sum is σ = 560922362. Its totient is φ = 258887232.

The previous prime is 388330853. The next prime is 388330871. The reversal of 388330857 is 758033883.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 340181136 + 48149721 = 18444^2 + 6939^2 .

It is not a de Polignac number, because 388330857 - 2² = 388330853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388330853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21573928 + ... + 21573945.

Almost surely, 2^388330857 is an apocalyptic number.

It is an amenable number.

388330857 is a deficient number, since it is larger than the sum of its proper divisors (172591505).

388330857 is a wasteful number, since it uses less digits than its factorization.

388330857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43147879 (or 43147876 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 388330857 is about 19706.1121736379. The cubic root of 388330857 is about 729.5705593301.

The spelling of 388330857 in words is "three hundred eighty-eight million, three hundred thirty thousand, eight hundred fifty-seven".