399061939 has 4 divisors (see below), whose sum is σ = 405604000. Its totient is φ = 392519880.

The previous prime is 399061933. The next prime is 399061981. The reversal of 399061939 is 939160993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399061939 - 2¹⁷ = 398930867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399061892 and 399061901.

It is not an unprimeable number, because it can be changed into a prime (399061933) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3270939 + ... + 3271060.

It is an arithmetic number, because the mean of its divisors is an integer number (101401000).

Almost surely, 2^399061939 is an apocalyptic number.

399061939 is a deficient number, since it is larger than the sum of its proper divisors (6542061).

399061939 is an equidigital number, since it uses as much as digits as its factorization.

399061939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6542060.

The product of its (nonzero) digits is 354294, while the sum is 49.

The square root of 399061939 is about 19976.5347095035. The cubic root of 399061939 is about 736.2298745127.

The spelling of 399061939 in words is "three hundred ninety-nine million, sixty-one thousand, nine hundred thirty-nine".