40565621 has 8 divisors (see below), whose sum is σ = 43263360. Its totient is φ = 37902528.

The previous prime is 40565599. The next prime is 40565633. The reversal of 40565621 is 12656504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40565621 - 2¹⁰ = 40564597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40565521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6221 + ... + 10946.

It is an arithmetic number, because the mean of its divisors is an integer number (5407920).

Almost surely, 2^40565621 is an apocalyptic number.

It is an amenable number.

40565621 is a deficient number, since it is larger than the sum of its proper divisors (2697739).

40565621 is a wasteful number, since it uses less digits than its factorization.

40565621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17323.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 40565621 is about 6369.1146166481. The cubic root of 40565621 is about 343.5996474812.

The spelling of 40565621 in words is "forty million, five hundred sixty-five thousand, six hundred twenty-one".