40320440 has 32 divisors (see below), whose sum is σ = 93852000. Its totient is φ = 15571584.

The previous prime is 40320431. The next prime is 40320461. The reversal of 40320440 is 4402304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16220 + ... + 18539.

It is an arithmetic number, because the mean of its divisors is an integer number (2932875).

Almost surely, 2^40320440 is an apocalyptic number.

40320440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40320440 is an abundant number, since it is smaller than the sum of its proper divisors (53531560).

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

40320440 is a wasteful number, since it uses less digits than its factorization.

40320440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34799 (or 34795 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40320440 is about 6349.8377932039. The cubic root of 40320440 is about 342.9060026267.

Adding to 40320440 its reverse (4402304), we get a palindrome (44722744).

The spelling of 40320440 in words is "forty million, three hundred twenty thousand, four hundred forty".