399297953 has 2 divisors, whose sum is σ = 399297954. Its totient is φ = 399297952.

The previous prime is 399297931. The next prime is 399297967. The reversal of 399297953 is 359792993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332989504 + 66308449 = 18248^2 + 8143^2 .

It is a cyclic number.

It is not a de Polignac number, because 399297953 - 2⁸ = 399297697 is a prime.

It is not a weakly prime, because it can be changed into another prime (399297253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199648976 + 199648977.

It is an arithmetic number, because the mean of its divisors is an integer number (199648977).

Almost surely, 2^399297953 is an apocalyptic number.

It is an amenable number.

399297953 is a deficient number, since it is larger than the sum of its proper divisors (1).

399297953 is an equidigital number, since it uses as much as digits as its factorization.

399297953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4133430, while the sum is 56.

The square root of 399297953 is about 19982.4411171408. The cubic root of 399297953 is about 736.3749867510.

The spelling of 399297953 in words is "three hundred ninety-nine million, two hundred ninety-seven thousand, nine hundred fifty-three".