402308681 has 2 divisors, whose sum is σ = 402308682. Its totient is φ = 402308680.

The previous prime is 402308671. The next prime is 402308701. The reversal of 402308681 is 186803204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357966400 + 44342281 = 18920^2 + 6659^2 .

It is a cyclic number.

It is not a de Polignac number, because 402308681 - 2¹⁰ = 402307657 is a prime.

It is a super-2 number, since 2×402308681² = 323704549615919522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (402308651) 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 as a sum of consecutive naturals, namely, 201154340 + 201154341.

It is an arithmetic number, because the mean of its divisors is an integer number (201154341).

Almost surely, 2^402308681 is an apocalyptic number.

It is an amenable number.

402308681 is a deficient number, since it is larger than the sum of its proper divisors (1).

402308681 is an equidigital number, since it uses as much as digits as its factorization.

402308681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 402308681 is about 20057.6339830998. The cubic root of 402308681 is about 738.2211234827.

The spelling of 402308681 in words is "four hundred two million, three hundred eight thousand, six hundred eighty-one".