390666591 has 16 divisors (see below), whose sum is σ = 661446400. Its totient is φ = 223237944.

The previous prime is 390666587. The next prime is 390666593. The reversal of 390666591 is 195666093.

It is not a de Polignac number, because 390666591 - 2² = 390666587 is a prime.

It is a super-2 number, since 2×390666591² = 305240770647122562, 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 (390666593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1033321 + ... + 1033698.

It is an arithmetic number, because the mean of its divisors is an integer number (41340400).

Almost surely, 2^390666591 is an apocalyptic number.

390666591 is a deficient number, since it is larger than the sum of its proper divisors (270779809).

390666591 is a wasteful number, since it uses less digits than its factorization.

390666591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067035 (or 2067029 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 390666591 is about 19765.2875263680. The cubic root of 390666591 is about 731.0303777011.

The spelling of 390666591 in words is "three hundred ninety million, six hundred sixty-six thousand, five hundred ninety-one".