399513523 has 8 divisors (see below), whose sum is σ = 420183936. Its totient is φ = 379329600.

The previous prime is 399513511. The next prime is 399513533. The reversal of 399513523 is 325315993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399513523 is a prime.

It is a super-2 number, since 2×399513523² = 319222110119743058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399513533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119938 + ... + 123223.

It is an arithmetic number, because the mean of its divisors is an integer number (52522992).

Almost surely, 2^399513523 is an apocalyptic number.

399513523 is a deficient number, since it is larger than the sum of its proper divisors (20670413).

399513523 is a wasteful number, since it uses less digits than its factorization.

399513523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243245.

The product of its digits is 109350, while the sum is 40.

The square root of 399513523 is about 19987.8343749392. The cubic root of 399513523 is about 736.5074791223.

The spelling of 399513523 in words is "three hundred ninety-nine million, five hundred thirteen thousand, five hundred twenty-three".