402006660 has 48 divisors (see below), whose sum is σ = 1227949632. Its totient is φ = 97456000.

The previous prime is 402006659. The next prime is 402006679. The reversal of 402006660 is 66600204.

It is a self number, because there is not a number n which added to its sum of digits gives 402006660.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303891 + ... + 305210.

It is an arithmetic number, because the mean of its divisors is an integer number (25582284).

Almost surely, 2^402006660 is an apocalyptic number.

It is an amenable number.

402006660 is an abundant number, since it is smaller than the sum of its proper divisors (825942972).

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

402006660 is a wasteful number, since it uses less digits than its factorization.

402006660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609124 (or 609122 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 402006660 is about 20050.1037403800. The cubic root of 402006660 is about 738.0363448879.

Adding to 402006660 its reverse (66600204), we get a palindrome (468606864).

The spelling of 402006660 in words is "four hundred two million, six thousand, six hundred sixty".