40440320 has 40 divisors (see below), whose sum is σ = 96968124. Its totient is φ = 16175104.

The previous prime is 40440319. The next prime is 40440347. The reversal of 40440320 is 2304404.

It can be written as a sum of positive squares in 2 ways, for example, as 40347904 + 92416 = 6352^2 + 304^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5339 + ... + 10458.

Almost surely, 2^40440320 is an apocalyptic number.

40440320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40440320 is an abundant number, since it is smaller than the sum of its proper divisors (56527804).

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

40440320 is an equidigital number, since it uses as much as digits as its factorization.

40440320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15820 (or 15804 counting only the distinct ones).

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

The square root of 40440320 is about 6359.2703984026. The cubic root of 40440320 is about 343.2455070126.

Adding to 40440320 its reverse (2304404), we get a palindrome (42744724).

The spelling of 40440320 in words is "forty million, four hundred forty thousand, three hundred twenty".