388239131 has 8 divisors (see below), whose sum is σ = 454020864. Its totient is φ = 325037160.

The previous prime is 388239109. The next prime is 388239139. The reversal of 388239131 is 131932883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-388239131 is a prime.

It is a super-2 number, since 2×388239131² = 301459245679270322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388239139) 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, 644615 + ... + 645216.

It is an arithmetic number, because the mean of its divisors is an integer number (56752608).

Almost surely, 2^388239131 is an apocalyptic number.

388239131 is a deficient number, since it is larger than the sum of its proper divisors (65781733).

388239131 is a wasteful number, since it uses less digits than its factorization.

388239131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289881.

The product of its digits is 31104, while the sum is 38.

The square root of 388239131 is about 19703.7846872117. The cubic root of 388239131 is about 729.5131118746.

The spelling of 388239131 in words is "three hundred eighty-eight million, two hundred thirty-nine thousand, one hundred thirty-one".