402368641 has 2 divisors, whose sum is σ = 402368642. Its totient is φ = 402368640.

The previous prime is 402368621. The next prime is 402368651. The reversal of 402368641 is 146863204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 286591041 + 115777600 = 16929^2 + 10760^2 .

It is a cyclic number.

It is not a de Polignac number, because 402368641 - 2⁹ = 402368129 is a prime.

It is equal to p_21455764 and since 402368641 and 21455764 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 402368597 and 402368606.

It is not a weakly prime, because it can be changed into another prime (402368621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201184320 + 201184321.

It is an arithmetic number, because the mean of its divisors is an integer number (201184321).

Almost surely, 2^402368641 is an apocalyptic number.

It is an amenable number.

402368641 is a deficient number, since it is larger than the sum of its proper divisors (1).

402368641 is an equidigital number, since it uses as much as digits as its factorization.

402368641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 402368641 is about 20059.1286201570. The cubic root of 402368641 is about 738.2577964338.

The spelling of 402368641 in words is "four hundred two million, three hundred sixty-eight thousand, six hundred forty-one".