390897065 has 24 divisors (see below), whose sum is σ = 536648280. Its totient is φ = 271669248.

The previous prime is 390897041. The next prime is 390897071. The reversal of 390897065 is 560798093.

It can be written as a sum of positive squares in 12 ways, for example, as 87684496 + 303212569 = 9364^2 + 17413^2 .

It is not a de Polignac number, because 390897065 - 2⁸ = 390896809 is a prime.

It is a super-2 number, since 2×390897065² = 305601030851228450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8381 + ... + 29189.

It is an arithmetic number, because the mean of its divisors is an integer number (22360345).

Almost surely, 2^390897065 is an apocalyptic number.

It is an amenable number.

390897065 is a deficient number, since it is larger than the sum of its proper divisors (145751215).

390897065 is a wasteful number, since it uses less digits than its factorization.

390897065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20861 (or 20844 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 390897065 is about 19771.1169386052. The cubic root of 390897065 is about 731.1741067169.

The spelling of 390897065 in words is "three hundred ninety million, eight hundred ninety-seven thousand, sixty-five".