399937513 has 4 divisors (see below), whose sum is σ = 400966020. Its totient is φ = 398909008.

The previous prime is 399937511. The next prime is 399937537. The reversal of 399937513 is 315739993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 124277904 + 275659609 = 11148^2 + 16603^2 .

It is a cyclic number.

It is not a de Polignac number, because 399937513 - 2¹ = 399937511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399937511) 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, 513670 + ... + 514447.

It is an arithmetic number, because the mean of its divisors is an integer number (100241505).

Almost surely, 2^399937513 is an apocalyptic number.

It is an amenable number.

399937513 is a deficient number, since it is larger than the sum of its proper divisors (1028507).

399937513 is a wasteful number, since it uses less digits than its factorization.

399937513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028506.

The product of its digits is 688905, while the sum is 49.

The square root of 399937513 is about 19998.4377639855. The cubic root of 399937513 is about 736.7679303840.

The spelling of 399937513 in words is "three hundred ninety-nine million, nine hundred thirty-seven thousand, five hundred thirteen".