390567257 has 2 divisors, whose sum is σ = 390567258. Its totient is φ = 390567256.

The previous prime is 390567253. The next prime is 390567259. The reversal of 390567257 is 752765093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354794896 + 35772361 = 18836^2 + 5981^2 .

It is a cyclic number.

It is not a de Polignac number, because 390567257 - 2² = 390567253 is a prime.

Together with 390567259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (390567253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195283628 + 195283629.

It is an arithmetic number, because the mean of its divisors is an integer number (195283629).

Almost surely, 2^390567257 is an apocalyptic number.

It is an amenable number.

390567257 is a deficient number, since it is larger than the sum of its proper divisors (1).

390567257 is an equidigital number, since it uses as much as digits as its factorization.

390567257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 44.

The square root of 390567257 is about 19762.7745268725. The cubic root of 390567257 is about 730.9684132462.

The spelling of 390567257 in words is "three hundred ninety million, five hundred sixty-seven thousand, two hundred fifty-seven".