399297961 has 4 divisors (see below), whose sum is σ = 399388500. Its totient is φ = 399207424.

The previous prime is 399297953. The next prime is 399297967. The reversal of 399297961 is 169792993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169792993 = 7577 ⋅22409.

It can be written as a sum of positive squares in 2 ways, for example, as 389312361 + 9985600 = 19731^2 + 3160^2 .

It is a cyclic number.

It is not a de Polignac number, because 399297961 - 2³ = 399297953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399297967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38296 + ... + 47593.

It is an arithmetic number, because the mean of its divisors is an integer number (99847125).

Almost surely, 2^399297961 is an apocalyptic number.

It is an amenable number.

399297961 is a deficient number, since it is larger than the sum of its proper divisors (90539).

399297961 is an equidigital number, since it uses as much as digits as its factorization.

399297961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90538.

The product of its digits is 1653372, while the sum is 55.

The square root of 399297961 is about 19982.4413173166. The cubic root of 399297961 is about 736.3749916688.

The spelling of 399297961 in words is "three hundred ninety-nine million, two hundred ninety-seven thousand, nine hundred sixty-one".