406640556 has 36 divisors (see below), whose sum is σ = 1174740112. Its totient is φ = 116182944.

The previous prime is 406640537. The next prime is 406640593. The reversal of 406640556 is 655046604.

It is a happy number.

406640556 is a `hidden beast` number, since 4 + 0 + 6 + 640 + 5 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 406640556.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 806575 + ... + 807078.

Almost surely, 2^406640556 is an apocalyptic number.

It is an amenable number.

406640556 is an abundant number, since it is smaller than the sum of its proper divisors (768099556).

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

406640556 is a wasteful number, since it uses less digits than its factorization.

406640556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613670 (or 1613665 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 406640556 is about 20165.3305452700. The cubic root of 406640556 is about 740.8612786481.

The spelling of 406640556 in words is "four hundred six million, six hundred forty thousand, five hundred fifty-six".