402682640 has 40 divisors (see below), whose sum is σ = 937076928. Its totient is φ = 160928640.

The previous prime is 402682633. The next prime is 402682649. The reversal of 402682640 is 46286204.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 402682597 and 402682606.

It is not an unprimeable number, because it can be changed into a prime (402682649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159629 + ... + 162131.

Almost surely, 2^402682640 is an apocalyptic number.

402682640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402682640 is an abundant number, since it is smaller than the sum of its proper divisors (534394288).

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

402682640 is a wasteful number, since it uses less digits than its factorization.

402682640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527 (or 4521 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 402682640 is about 20066.9539292838. The cubic root of 402682640 is about 738.4497861600.

The spelling of 402682640 in words is "four hundred two million, six hundred eighty-two thousand, six hundred forty".