390780081 has 12 divisors (see below), whose sum is σ = 567299200. Its totient is φ = 259209720.

The previous prime is 390780073. The next prime is 390780083. The reversal of 390780081 is 180087093.

It is not a de Polignac number, because 390780081 - 2³ = 390780073 is a prime.

It is a super-2 number, since 2×390780081² = 305418143412733122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390780083) 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, 107305 + ... + 110886.

Almost surely, 2^390780081 is an apocalyptic number.

It is an amenable number.

390780081 is a deficient number, since it is larger than the sum of its proper divisors (176519119).

390780081 is a wasteful number, since it uses less digits than its factorization.

390780081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218396 (or 218393 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 390780081 is about 19768.1582601921. The cubic root of 390780081 is about 731.1011598010.

The spelling of 390780081 in words is "three hundred ninety million, seven hundred eighty thousand, eighty-one".