40404640 has 48 divisors (see below), whose sum is σ = 100487520. Its totient is φ = 15310080.

The previous prime is 40404613. The next prime is 40404641. The reversal of 40404640 is 4640404.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (40404641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3606 + ... + 9685.

It is an arithmetic number, because the mean of its divisors is an integer number (2093490).

Almost surely, 2^40404640 is an apocalyptic number.

40404640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40404640 is an abundant number, since it is smaller than the sum of its proper divisors (60082880).

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

40404640 is a wasteful number, since it uses less digits than its factorization.

40404640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13325 (or 13317 counting only the distinct ones).

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

The square root of 40404640 is about 6356.4644260784. The cubic root of 40404640 is about 343.1445302049.

The spelling of 40404640 in words is "forty million, four hundred four thousand, six hundred forty".