402644961 has 24 divisors (see below), whose sum is σ = 603046080. Its totient is φ = 258574176.

The previous prime is 402644947. The next prime is 402644981. The reversal of 402644961 is 169446204.

402644961 is a `hidden beast` number, since 4 + 0 + 2 + 644 + 9 + 6 + 1 = 666.

It is not a de Polignac number, because 402644961 - 2⁶ = 402644897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (402644981) 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 in 23 ways as a sum of consecutive naturals, for example, 129750 + ... + 132816.

It is an arithmetic number, because the mean of its divisors is an integer number (25126920).

Almost surely, 2^402644961 is an apocalyptic number.

It is an amenable number.

402644961 is a deficient number, since it is larger than the sum of its proper divisors (200401119).

402644961 is a wasteful number, since it uses less digits than its factorization.

402644961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3605 (or 3602 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 402644961 is about 20066.0150752460. The cubic root of 402644961 is about 738.4267532017.

The spelling of 402644961 in words is "four hundred two million, six hundred forty-four thousand, nine hundred sixty-one".