388172331 has 12 divisors (see below), whose sum is σ = 581460152. Its totient is φ = 258781392.

The previous prime is 388172329. The next prime is 388172381. The reversal of 388172331 is 133271883.

It is not a de Polignac number, because 388172331 - 2¹ = 388172329 is a prime.

It is a super-2 number, since 2×388172331² = 301355517107947122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388172321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 798466 + ... + 798951.

Almost surely, 2^388172331 is an apocalyptic number.

388172331 is a deficient number, since it is larger than the sum of its proper divisors (193287821).

388172331 is an equidigital number, since it uses as much as digits as its factorization.

388172331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597432 (or 1597420 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 388172331 is about 19702.0895084760. The cubic root of 388172331 is about 729.4712697322.

The spelling of 388172331 in words is "three hundred eighty-eight million, one hundred seventy-two thousand, three hundred thirty-one".