40320040 has 16 divisors (see below), whose sum is σ = 90720180. Its totient is φ = 16128000.

The previous prime is 40320037. The next prime is 40320041. The reversal of 40320040 is 4002304.

It can be written as a sum of positive squares in 2 ways, for example, as 38365636 + 1954404 = 6194^2 + 1398^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40320040.

It is not an unprimeable number, because it can be changed into a prime (40320041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503961 + ... + 504040.

Almost surely, 2^40320040 is an apocalyptic number.

40320040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40320040 is an abundant number, since it is smaller than the sum of its proper divisors (50400140).

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

40320040 is a wasteful number, since it uses less digits than its factorization.

40320040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008012 (or 1008008 counting only the distinct ones).

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

The square root of 40320040 is about 6349.8062962582. The cubic root of 40320040 is about 342.9048686869.

Adding to 40320040 its reverse (4002304), we get a palindrome (44322344).

The spelling of 40320040 in words is "forty million, three hundred twenty thousand, forty".