390940281 has 12 divisors (see below), whose sum is σ = 566944560. Its totient is φ = 259587000.

The previous prime is 390940241. The next prime is 390940301. The reversal of 390940281 is 182049093.

It is not a de Polignac number, because 390940281 - 2²² = 386745977 is a prime.

It is a super-2 number, since 2×390940281² = 305668606616717922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (390940201) 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, 84271 + ... + 88788.

It is an arithmetic number, because the mean of its divisors is an integer number (47245380).

Almost surely, 2^390940281 is an apocalyptic number.

It is an amenable number.

390940281 is a deficient number, since it is larger than the sum of its proper divisors (176004279).

390940281 is a wasteful number, since it uses less digits than its factorization.

390940281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173316 (or 173313 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 390940281 is about 19772.2098157995. The cubic root of 390940281 is about 731.2010509422.

The spelling of 390940281 in words is "three hundred ninety million, nine hundred forty thousand, two hundred eighty-one".