390256497 has 6 divisors (see below), whose sum is σ = 563703842. Its totient is φ = 260170992.

The previous prime is 390256483. The next prime is 390256549. The reversal of 390256497 is 794652093.

It is a happy number.

390256497 is a `hidden beast` number, since 390 + 256 + 4 + 9 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 307791936 + 82464561 = 17544^2 + 9081^2 .

It is a de Polignac number, because none of the positive numbers 2^k-390256497 is a prime.

It is a super-2 number, since 2×390256497² = 304600266901422018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390256397) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21680908 + ... + 21680925.

Almost surely, 2^390256497 is an apocalyptic number.

It is an amenable number.

390256497 is a deficient number, since it is larger than the sum of its proper divisors (173447345).

390256497 is a wasteful number, since it uses less digits than its factorization.

390256497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43361839 (or 43361836 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 390256497 is about 19754.9107059485. The cubic root of 390256497 is about 730.7744935793.

The spelling of 390256497 in words is "three hundred ninety million, two hundred fifty-six thousand, four hundred ninety-seven".