399936679 has 16 divisors (see below), whose sum is σ = 440462880. Its totient is φ = 361589760.

The previous prime is 399936661. The next prime is 399936683. The reversal of 399936679 is 976639993.

It is a cyclic number.

It is not a de Polignac number, because 399936679 - 2¹¹ = 399934631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399936629) 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 15 ways as a sum of consecutive naturals, for example, 40107 + ... + 49075.

It is an arithmetic number, because the mean of its divisors is an integer number (27528930).

Almost surely, 2^399936679 is an apocalyptic number.

399936679 is a deficient number, since it is larger than the sum of its proper divisors (40526201).

399936679 is a wasteful number, since it uses less digits than its factorization.

399936679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9090.

The product of its digits is 14880348, while the sum is 61.

The square root of 399936679 is about 19998.4169123458. The cubic root of 399936679 is about 736.7674182499.

The spelling of 399936679 in words is "three hundred ninety-nine million, nine hundred thirty-six thousand, six hundred seventy-nine".