402276721 has 36 divisors (see below), whose sum is σ = 541586640. Its totient is φ = 296881200.

The previous prime is 402276649. The next prime is 402276733. The reversal of 402276721 is 127672204.

It is not a de Polignac number, because 402276721 - 2¹¹ = 402274673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402276521) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 110866 + ... + 114436.

Almost surely, 2^402276721 is an apocalyptic number.

It is an amenable number.

402276721 is a deficient number, since it is larger than the sum of its proper divisors (139309919).

402276721 is a wasteful number, since it uses less digits than its factorization.

402276721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3626 (or 3608 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 402276721 is about 20056.8372631380. The cubic root of 402276721 is about 738.2015745037.

The spelling of 402276721 in words is "four hundred two million, two hundred seventy-six thousand, seven hundred twenty-one".