402187220 has 48 divisors (see below), whose sum is σ = 857115840. Its totient is φ = 158505984.

The previous prime is 402187217. The next prime is 402187243. The reversal of 402187220 is 22781204.

It is a self number, because there is not a number n which added to its sum of digits gives 402187220.

It is a congruent number.

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, 734987 + ... + 735533.

It is an arithmetic number, because the mean of its divisors is an integer number (17856580).

Almost surely, 2^402187220 is an apocalyptic number.

It is an amenable number.

402187220 is an abundant number, since it is smaller than the sum of its proper divisors (454928620).

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

402187220 is a wasteful number, since it uses less digits than its factorization.

402187220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032 (or 1030 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 402187220 is about 20054.6059547427. The cubic root of 402187220 is about 738.1468239003.

The spelling of 402187220 in words is "four hundred two million, one hundred eighty-seven thousand, two hundred twenty".