40640404 has 36 divisors (see below), whose sum is σ = 87606036. Its totient is φ = 16391424.

The previous prime is 40640399. The next prime is 40640417. The reversal of 40640404 is 40404604.

It is a happy number.

40640404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 30272004 + 10368400 = 5502^2 + 3220^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2767 + ... + 9430.

It is an arithmetic number, because the mean of its divisors is an integer number (2433501).

Almost surely, 2^40640404 is an apocalyptic number.

It is an amenable number.

40640404 is an abundant number, since it is smaller than the sum of its proper divisors (46965632).

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

40640404 is a wasteful number, since it uses less digits than its factorization.

40640404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12232 (or 12223 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 40640404 is about 6374.9826666431. The cubic root of 40640404 is about 343.8106606336.

The spelling of 40640404 in words is "forty million, six hundred forty thousand, four hundred four".