399098969 has 2 divisors, whose sum is σ = 399098970. Its totient is φ = 399098968.

The previous prime is 399098923. The next prime is 399098977. The reversal of 399098969 is 969890993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398521369 + 577600 = 19963^2 + 760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399098969 is a prime.

It is a super-2 number, since 2×399098969² = 318559974113725922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399098989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199549484 + 199549485.

It is an arithmetic number, because the mean of its divisors is an integer number (199549485).

Almost surely, 2^399098969 is an apocalyptic number.

It is an amenable number.

399098969 is a deficient number, since it is larger than the sum of its proper divisors (1).

399098969 is an equidigital number, since it uses as much as digits as its factorization.

399098969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8503056, while the sum is 62.

The square root of 399098969 is about 19977.4615254291. The cubic root of 399098969 is about 736.2526460396.

The spelling of 399098969 in words is "three hundred ninety-nine million, ninety-eight thousand, nine hundred sixty-nine".