40290920 has 32 divisors (see below), whose sum is σ = 91561320. Its totient is φ = 15955200.

The previous prime is 40290907. The next prime is 40290937. The reversal of 40290920 is 2909204.

It can be written as a sum of positive squares in 4 ways, for example, as 34597924 + 5692996 = 5882^2 + 2386^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40290920.

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, 947 + ... + 9026.

Almost surely, 2^40290920 is an apocalyptic number.

40290920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40290920 is an abundant number, since it is smaller than the sum of its proper divisors (51270400).

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

40290920 is a wasteful number, since it uses less digits than its factorization.

40290920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10085 (or 10081 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 40290920 is about 6347.5128987659. The cubic root of 40290920 is about 342.8222977154.

The spelling of 40290920 in words is "forty million, two hundred ninety thousand, nine hundred twenty".