390999231 has 40 divisors (see below), whose sum is σ = 669701120. Its totient is φ = 222700752.

The previous prime is 390999221. The next prime is 390999263. The reversal of 390999231 is 132999093.

It is not a de Polignac number, because 390999231 - 2⁹ = 390998719 is a prime.

It is a super-2 number, since 2×390999231² = 305760797285182722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390999221) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 207150 + ... + 209028.

It is an arithmetic number, because the mean of its divisors is an integer number (16742528).

Almost surely, 2^390999231 is an apocalyptic number.

390999231 is a deficient number, since it is larger than the sum of its proper divisors (278701889).

390999231 is a wasteful number, since it uses less digits than its factorization.

390999231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265 (or 2256 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 390999231 is about 19773.7004882748. The cubic root of 390999231 is about 731.2378017689.

The spelling of 390999231 in words is "three hundred ninety million, nine hundred ninety-nine thousand, two hundred thirty-one".