399297960 has 48 divisors (see below), whose sum is σ = 1297719540. Its totient is φ = 106479360.

The previous prime is 399297953. The next prime is 399297967. The reversal of 399297960 is 69792993.

It is an interprime number because it is at equal distance from previous prime (399297953) and next prime (399297967).

It can be written as a sum of positive squares in 2 ways, for example, as 394181316 + 5116644 = 19854^2 + 2262^2 .

It is a junction number, because it is equal to n+sod(n) for n = 399297897 and 399297906.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 554221 + ... + 554940.

Almost surely, 2^399297960 is an apocalyptic number.

399297960 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399297960 is an abundant number, since it is smaller than the sum of its proper divisors (898421580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399297960 is a wasteful number, since it uses less digits than its factorization.

399297960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109178 (or 1109171 counting only the distinct ones).

The product of its (nonzero) digits is 1653372, while the sum is 54.

The square root of 399297960 is about 19982.4412922946. The cubic root of 399297960 is about 736.3749910541.

The spelling of 399297960 in words is "three hundred ninety-nine million, two hundred ninety-seven thousand, nine hundred sixty".