399394070 has 8 divisors (see below), whose sum is σ = 718909344. Its totient is φ = 159757624.

The previous prime is 399394067. The next prime is 399394081. The reversal of 399394070 is 70493993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19969694 + ... + 19969713.

It is an arithmetic number, because the mean of its divisors is an integer number (89863668).

Almost surely, 2^399394070 is an apocalyptic number.

399394070 is a deficient number, since it is larger than the sum of its proper divisors (319515274).

399394070 is a wasteful number, since it uses less digits than its factorization.

399394070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39939414.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 399394070 is about 19984.8460089139. The cubic root of 399394070 is about 736.4340675082.

The spelling of 399394070 in words is "three hundred ninety-nine million, three hundred ninety-four thousand, seventy".