402639613 has 2 divisors, whose sum is σ = 402639614. Its totient is φ = 402639612.

The previous prime is 402639593. The next prime is 402639619. The reversal of 402639613 is 316936204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401721849 + 917764 = 20043^2 + 958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402639613 is a prime.

It is equal to p_21469453 and since 402639613 and 21469453 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402639619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201319806 + 201319807.

It is an arithmetic number, because the mean of its divisors is an integer number (201319807).

Almost surely, 2^402639613 is an apocalyptic number.

It is an amenable number.

402639613 is a deficient number, since it is larger than the sum of its proper divisors (1).

402639613 is an equidigital number, since it uses as much as digits as its factorization.

402639613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 402639613 is about 20065.8818146624. The cubic root of 402639613 is about 738.4234838833.

The spelling of 402639613 in words is "four hundred two million, six hundred thirty-nine thousand, six hundred thirteen".