402904813 has 2 divisors, whose sum is σ = 402904814. Its totient is φ = 402904812.

The previous prime is 402904793. The next prime is 402904829. The reversal of 402904813 is 318409204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 326814084 + 76090729 = 18078^2 + 8723^2 .

It is a cyclic number.

It is not a de Polignac number, because 402904813 - 2¹³ = 402896621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402904213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201452406 + 201452407.

It is an arithmetic number, because the mean of its divisors is an integer number (201452407).

Almost surely, 2^402904813 is an apocalyptic number.

It is an amenable number.

402904813 is a deficient number, since it is larger than the sum of its proper divisors (1).

402904813 is an equidigital number, since it uses as much as digits as its factorization.

402904813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 402904813 is about 20072.4889587714. The cubic root of 402904813 is about 738.5855700456.

The spelling of 402904813 in words is "four hundred two million, nine hundred four thousand, eight hundred thirteen".