40564621 has 4 divisors (see below), whose sum is σ = 41554044. Its totient is φ = 39575200.

The previous prime is 40564607. The next prime is 40564631. The reversal of 40564621 is 12646504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7502121 + 33062500 = 2739^2 + 5750^2 .

It is a cyclic number.

It is not a de Polignac number, because 40564621 - 2⁷ = 40564493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40564621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40564631) 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, 494650 + ... + 494731.

It is an arithmetic number, because the mean of its divisors is an integer number (10388511).

Almost surely, 2^40564621 is an apocalyptic number.

40564621 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40564621 is a deficient number, since it is larger than the sum of its proper divisors (989423).

40564621 is an equidigital number, since it uses as much as digits as its factorization.

40564621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989422.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 40564621 is about 6369.0361123172. The cubic root of 40564621 is about 343.5968240520.

The spelling of 40564621 in words is "forty million, five hundred sixty-four thousand, six hundred twenty-one".