406557220 has 12 divisors (see below), whose sum is σ = 853770204. Its totient is φ = 162622880.

The previous prime is 406557209. The next prime is 406557233. The reversal of 406557220 is 22755604.

It can be written as a sum of positive squares in 2 ways, for example, as 92275236 + 314281984 = 9606^2 + 17728^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10163911 + ... + 10163950.

It is an arithmetic number, because the mean of its divisors is an integer number (71147517).

Almost surely, 2^406557220 is an apocalyptic number.

It is an amenable number.

406557220 is an abundant number, since it is smaller than the sum of its proper divisors (447212984).

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

406557220 is a wasteful number, since it uses less digits than its factorization.

406557220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20327870 (or 20327868 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 406557220 is about 20163.2641206725. The cubic root of 406557220 is about 740.8106650429.

The spelling of 406557220 in words is "four hundred six million, five hundred fifty-seven thousand, two hundred twenty".