399068690 has 16 divisors (see below), whose sum is σ = 719103960. Its totient is φ = 159454080.

The previous prime is 399068687. The next prime is 399068701. The reversal of 399068690 is 96860993.

It can be written as a sum of positive squares in 4 ways, for example, as 362864401 + 36204289 = 19049^2 + 6017^2 .

It is a super-2 number, since 2×399068690² = 318511638676632200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11795 + ... + 30614.

Almost surely, 2^399068690 is an apocalyptic number.

399068690 is a deficient number, since it is larger than the sum of its proper divisors (320035270).

399068690 is a wasteful number, since it uses less digits than its factorization.

399068690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43357.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 399068690 is about 19976.7036820392. The cubic root of 399068690 is about 736.2340261321.

The spelling of 399068690 in words is "three hundred ninety-nine million, sixty-eight thousand, six hundred ninety".