40655556 has 36 divisors (see below), whose sum is σ = 103931100. Its totient is φ = 13398528.

The previous prime is 40655509. The next prime is 40655591. The reversal of 40655556 is 65555604.

It is a happy number.

40655556 is a `hidden beast` number, since 40 + 65 + 5 + 556 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6081156 + 34574400 = 2466^2 + 5880^2 .

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 zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 40655556.

It is a congruent number.

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, 3141 + ... + 9548.

It is an arithmetic number, because the mean of its divisors is an integer number (2886975).

Almost surely, 2^40655556 is an apocalyptic number.

It is an amenable number.

40655556 is an abundant number, since it is smaller than the sum of its proper divisors (63275544).

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

40655556 is a wasteful number, since it uses less digits than its factorization.

40655556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12788 (or 12783 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 40655556 is about 6376.1709512842. The cubic root of 40655556 is about 343.8533830751.

The spelling of 40655556 in words is "forty million, six hundred fifty-five thousand, five hundred fifty-six".