40404656 has 60 divisors (see below), whose sum is σ = 85202880. Its totient is φ = 18520320.

The previous prime is 40404653. The next prime is 40404667. The reversal of 40404656 is 65640404.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (40404653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 762326 + ... + 762378.

It is an arithmetic number, because the mean of its divisors is an integer number (1420048).

Almost surely, 2^40404656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40404656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42601440).

40404656 is an abundant number, since it is smaller than the sum of its proper divisors (44798224).

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

40404656 is a wasteful number, since it uses less digits than its factorization.

40404656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 40404656 is about 6356.4656846395. The cubic root of 40404656 is about 343.1445754993.

The spelling of 40404656 in words is "forty million, four hundred four thousand, six hundred fifty-six".