402040660 has 24 divisors (see below), whose sum is σ = 964897920. Its totient is φ = 137842464.

The previous prime is 402040657. The next prime is 402040673. The reversal of 402040660 is 66040204.

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, 1435720 + ... + 1435999.

It is an arithmetic number, because the mean of its divisors is an integer number (40204080).

Almost surely, 2^402040660 is an apocalyptic number.

It is an amenable number.

402040660 is an abundant number, since it is smaller than the sum of its proper divisors (562857260).

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

402040660 is a wasteful number, since it uses less digits than its factorization.

402040660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871735 (or 2871733 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 402040660 is about 20050.9515983656. The cubic root of 402040660 is about 738.0571509514.

Adding to 402040660 its reverse (66040204), we get a palindrome (468080864).

The spelling of 402040660 in words is "four hundred two million, forty thousand, six hundred sixty".