40809620 has 12 divisors (see below), whose sum is σ = 85700244. Its totient is φ = 16323840.

The previous prime is 40809607. The next prime is 40809647. The reversal of 40809620 is 2690804.

40809620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 20757136 + 20052484 = 4556^2 + 4478^2 .

It is a congruent number.

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, 1020221 + ... + 1020260.

It is an arithmetic number, because the mean of its divisors is an integer number (7141687).

Almost surely, 2^40809620 is an apocalyptic number.

It is an amenable number.

40809620 is an abundant number, since it is smaller than the sum of its proper divisors (44890624).

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

40809620 is a wasteful number, since it uses less digits than its factorization.

40809620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040490 (or 2040488 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40809620 is about 6388.2407593953. The cubic root of 40809620 is about 344.2871790647.

The spelling of 40809620 in words is "forty million, eight hundred nine thousand, six hundred twenty".