390955897 has 2 divisors, whose sum is σ = 390955898. Its totient is φ = 390955896.

The previous prime is 390955883. The next prime is 390955927. The reversal of 390955897 is 798559093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286997481 + 103958416 = 16941^2 + 10196^2 .

It is a cyclic number.

It is not a de Polignac number, because 390955897 - 2⁷ = 390955769 is a prime.

It is not a weakly prime, because it can be changed into another prime (390955867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195477948 + 195477949.

It is an arithmetic number, because the mean of its divisors is an integer number (195477949).

Almost surely, 2^390955897 is an apocalyptic number.

It is an amenable number.

390955897 is a deficient number, since it is larger than the sum of its proper divisors (1).

390955897 is an equidigital number, since it uses as much as digits as its factorization.

390955897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3061800, while the sum is 55.

The square root of 390955897 is about 19772.6047095470. The cubic root of 390955897 is about 731.2107866863.

The spelling of 390955897 in words is "three hundred ninety million, nine hundred fifty-five thousand, eight hundred ninety-seven".