402309980 has 24 divisors (see below), whose sum is σ = 845691840. Its totient is φ = 160763840.

The previous prime is 402309977. The next prime is 402310003. The reversal of 402309980 is 89903204.

It is a self number, because there is not a number n which added to its sum of digits gives 402309980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11741 + ... + 30699.

It is an arithmetic number, because the mean of its divisors is an integer number (35237160).

Almost surely, 2^402309980 is an apocalyptic number.

It is an amenable number.

402309980 is an abundant number, since it is smaller than the sum of its proper divisors (443381860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402309980 is a wasteful number, since it uses less digits than its factorization.

402309980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20029 (or 20027 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 402309980 is about 20057.6663647594. Note that the first 3 decimals coincide. The cubic root of 402309980 is about 738.2219180204.

The spelling of 402309980 in words is "four hundred two million, three hundred nine thousand, nine hundred eighty".