399936239 has 4 divisors (see below), whose sum is σ = 412837440. Its totient is φ = 387035040.

The previous prime is 399936233. The next prime is 399936253. The reversal of 399936239 is 932639993.

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 399936239 - 2⁴ = 399936223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399936233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6450554 + ... + 6450615.

It is an arithmetic number, because the mean of its divisors is an integer number (103209360).

Almost surely, 2^399936239 is an apocalyptic number.

399936239 is a deficient number, since it is larger than the sum of its proper divisors (12901201).

399936239 is a wasteful number, since it uses less digits than its factorization.

399936239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12901200.

The product of its digits is 2125764, while the sum is 53.

The square root of 399936239 is about 19998.4059114720. The cubic root of 399936239 is about 736.7671480590.

The spelling of 399936239 in words is "three hundred ninety-nine million, nine hundred thirty-six thousand, two hundred thirty-nine".