399393941 has 4 divisors (see below), whose sum is σ = 399527232. Its totient is φ = 399260652.

The previous prime is 399393931. The next prime is 399393959. The reversal of 399393941 is 149393993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399393941 is a prime.

It is a super-2 number, since 2×399393941² = 319031040215022962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399393941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399393931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62045 + ... + 68178.

It is an arithmetic number, because the mean of its divisors is an integer number (99881808).

Almost surely, 2^399393941 is an apocalyptic number.

It is an amenable number.

399393941 is a deficient number, since it is larger than the sum of its proper divisors (133291).

399393941 is a wasteful number, since it uses less digits than its factorization.

399393941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133290.

The product of its digits is 708588, while the sum is 50.

The square root of 399393941 is about 19984.8427814682. The cubic root of 399393941 is about 736.4339882214.

The spelling of 399393941 in words is "three hundred ninety-nine million, three hundred ninety-three thousand, nine hundred forty-one".