402446641 has 2 divisors, whose sum is σ = 402446642. Its totient is φ = 402446640.

The previous prime is 402446633. The next prime is 402446651. The reversal of 402446641 is 146644204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225450225 + 176996416 = 15015^2 + 13304^2 .

It is a cyclic number.

It is not a de Polignac number, because 402446641 - 2³ = 402446633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (402446651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201223320 + 201223321.

It is an arithmetic number, because the mean of its divisors is an integer number (201223321).

Almost surely, 2^402446641 is an apocalyptic number.

It is an amenable number.

402446641 is a deficient number, since it is larger than the sum of its proper divisors (1).

402446641 is an equidigital number, since it uses as much as digits as its factorization.

402446641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 402446641 is about 20061.0727778950. The cubic root of 402446641 is about 738.3054976226.

The spelling of 402446641 in words is "four hundred two million, four hundred forty-six thousand, six hundred forty-one".