390474817 has 2 divisors, whose sum is σ = 390474818. Its totient is φ = 390474816.

The previous prime is 390474793. The next prime is 390474859. The reversal of 390474817 is 718474093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379821121 + 10653696 = 19489^2 + 3264^2 .

It is a cyclic number.

It is not a de Polignac number, because 390474817 - 2¹⁵ = 390442049 is a prime.

It is a super-2 number, since 2×390474817² = 304941165422366978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (390474517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195237408 + 195237409.

It is an arithmetic number, because the mean of its divisors is an integer number (195237409).

Almost surely, 2^390474817 is an apocalyptic number.

It is an amenable number.

390474817 is a deficient number, since it is larger than the sum of its proper divisors (1).

390474817 is an equidigital number, since it uses as much as digits as its factorization.

390474817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 390474817 is about 19760.4356480316. The cubic root of 390474817 is about 730.9107398234.

The spelling of 390474817 in words is "three hundred ninety million, four hundred seventy-four thousand, eight hundred seventeen".