4090820 has 24 divisors (see below), whose sum is σ = 8659224. Its totient is φ = 1623296.

The previous prime is 4090813. The next prime is 4090837. The reversal of 4090820 is 280904.

It can be written as a sum of positive squares in 4 ways, for example, as 1214404 + 2876416 = 1102^2 + 1696^2 .

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 7 ways as a sum of consecutive naturals, for example, 1994 + ... + 3486.

It is an arithmetic number, because the mean of its divisors is an integer number (360801).

Almost surely, 2^4090820 is an apocalyptic number.

It is an amenable number.

4090820 is an abundant number, since it is smaller than the sum of its proper divisors (4568404).

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

4090820 is a wasteful number, since it uses less digits than its factorization.

4090820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639 (or 1637 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 4090820 is about 2022.5775634076. The cubic root of 4090820 is about 159.9325236307.

The spelling of 4090820 in words is "four million, ninety thousand, eight hundred twenty".