40031660 has 12 divisors (see below), whose sum is σ = 84066528. Its totient is φ = 16012656.

The previous prime is 40031657. The next prime is 40031713. The reversal of 40031660 is 6613004.

40031660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 2001583 = 40031660 / (4 + 0 + 0 + 3 + 1 + 6 + 6 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000772 + ... + 1000811.

It is an arithmetic number, because the mean of its divisors is an integer number (7005544).

Almost surely, 2^40031660 is an apocalyptic number.

It is an amenable number.

40031660 is an abundant number, since it is smaller than the sum of its proper divisors (44034868).

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

40031660 is a wasteful number, since it uses less digits than its factorization.

40031660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001592 (or 2001590 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 40031660 is about 6327.0577680309. The cubic root of 40031660 is about 342.0853952710.

Adding to 40031660 its reverse (6613004), we get a palindrome (46644664).

The spelling of 40031660 in words is "forty million, thirty-one thousand, six hundred sixty".