40586921 has 4 divisors (see below), whose sum is σ = 41986500. Its totient is φ = 39187344.

The previous prime is 40586911. The next prime is 40586933. The reversal of 40586921 is 12968504.

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 6528025 + 34058896 = 2555^2 + 5836^2 .

It is a cyclic number.

It is not a de Polignac number, because 40586921 - 2¹⁸ = 40324777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40586911) 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, 699746 + ... + 699803.

It is an arithmetic number, because the mean of its divisors is an integer number (10496625).

Almost surely, 2^40586921 is an apocalyptic number.

It is an amenable number.

40586921 is a deficient number, since it is larger than the sum of its proper divisors (1399579).

40586921 is a wasteful number, since it uses less digits than its factorization.

40586921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399578.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 40586921 is about 6370.7865291501. The cubic root of 40586921 is about 343.6597755053.

The spelling of 40586921 in words is "forty million, five hundred eighty-six thousand, nine hundred twenty-one".