399999479 has 16 divisors (see below), whose sum is σ = 451851264. Its totient is φ = 350803200.

The previous prime is 399999473. The next prime is 399999497. The reversal of 399999479 is 974999993.

It is not a de Polignac number, because 399999479 - 2²⁴ = 383222263 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 (399999473) 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 15 ways as a sum of consecutive naturals, for example, 118712 + ... + 122034.

It is an arithmetic number, because the mean of its divisors is an integer number (28240704).

Almost surely, 2^399999479 is an apocalyptic number.

399999479 is a deficient number, since it is larger than the sum of its proper divisors (51851785).

399999479 is a wasteful number, since it uses less digits than its factorization.

399999479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3718.

The product of its digits is 44641044, while the sum is 68.

The square root of 399999479 is about 19999.9869749958. The cubic root of 399999479 is about 736.8059798312.

The spelling of 399999479 in words is "three hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred seventy-nine".