388977939 has 12 divisors (see below), whose sum is σ = 642122416. Its totient is φ = 222273072.

The previous prime is 388977913. The next prime is 388977949. The reversal of 388977939 is 939779883.

It is a happy number.

It is not a de Polignac number, because 388977939 - 2⁸ = 388977683 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 6174253 = 388977939 / (3 + 8 + 8 + 9 + 7 + 7 + 9 + 3 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388977949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3087064 + ... + 3087189.

Almost surely, 2^388977939 is an apocalyptic number.

388977939 is a deficient number, since it is larger than the sum of its proper divisors (253144477).

388977939 is a wasteful number, since it uses less digits than its factorization.

388977939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6174266 (or 6174263 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The square root of 388977939 is about 19722.5236468359. The cubic root of 388977939 is about 729.9755662054.

The spelling of 388977939 in words is "three hundred eighty-eight million, nine hundred seventy-seven thousand, nine hundred thirty-nine".