399513533 has 2 divisors, whose sum is σ = 399513534. Its totient is φ = 399513532.

The previous prime is 399513511. The next prime is 399513547. The reversal of 399513533 is 335315993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395095129 + 4418404 = 19877^2 + 2102^2 .

It is an emirp because it is prime and its reverse (335315993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399513533 - 2²⁶ = 332404669 is a prime.

It is a super-2 number, since 2×399513533² = 319222126100284178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399713533) 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 as a sum of consecutive naturals, namely, 199756766 + 199756767.

It is an arithmetic number, because the mean of its divisors is an integer number (199756767).

Almost surely, 2^399513533 is an apocalyptic number.

It is an amenable number.

399513533 is a deficient number, since it is larger than the sum of its proper divisors (1).

399513533 is an equidigital number, since it uses as much as digits as its factorization.

399513533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164025, while the sum is 41.

The square root of 399513533 is about 19987.8346250913. The cubic root of 399513533 is about 736.5074852673.

The spelling of 399513533 in words is "three hundred ninety-nine million, five hundred thirteen thousand, five hundred thirty-three".