40040320 has 32 divisors (see below), whose sum is σ = 95722920. Its totient is φ = 16015872.

The previous prime is 40040293. The next prime is 40040393. The reversal of 40040320 is 2304004.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 40040320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30642 + ... + 31921.

Almost surely, 2^40040320 is an apocalyptic number.

40040320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40040320 is an abundant number, since it is smaller than the sum of its proper divisors (55682600).

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

40040320 is an equidigital number, since it uses as much as digits as its factorization.

40040320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62582 (or 62570 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 40040320 is about 6327.7420933537. The cubic root of 40040320 is about 342.1100611307.

Adding to 40040320 its reverse (2304004), we get a palindrome (42344324).

The spelling of 40040320 in words is "forty million, forty thousand, three hundred twenty".