399999970 has 64 divisors (see below), whose sum is σ = 824411520. Its totient is φ = 138765312.

The previous prime is 399999959. The next prime is 400000009. The reversal of 399999970 is 79999993.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 117837 + ... + 121183.

It is an arithmetic number, because the mean of its divisors is an integer number (12881430).

Almost surely, 2^399999970 is an apocalyptic number.

399999970 is an abundant number, since it is smaller than the sum of its proper divisors (424411550).

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

399999970 is a wasteful number, since it uses less digits than its factorization.

399999970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427.

The product of its (nonzero) digits is 11160261, while the sum is 64.

The square root of 399999970 is about 19999.9992500000. Note that the first 3 decimals coincide. The cubic root of 399999970 is about 736.8062813079.

The spelling of 399999970 in words is "three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy".