399400970 has 16 divisors (see below), whose sum is σ = 719948520. Its totient is φ = 159532224.

The previous prime is 399400943. The next prime is 399400973. The reversal of 399400970 is 79004993.

It can be written as a sum of positive squares in 4 ways, for example, as 116791249 + 282609721 = 10807^2 + 16811^2 .

It is a super-2 number, since 2×399400970² = 319042269673881800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399400973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21077 + ... + 35256.

Almost surely, 2^399400970 is an apocalyptic number.

399400970 is a deficient number, since it is larger than the sum of its proper divisors (320547550).

399400970 is a wasteful number, since it uses less digits than its factorization.

399400970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57049.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 399400970 is about 19985.0186389705. The cubic root of 399400970 is about 736.4383084039.

The spelling of 399400970 in words is "three hundred ninety-nine million, four hundred thousand, nine hundred seventy".