40928521 has 4 divisors (see below), whose sum is σ = 40985092. Its totient is φ = 40871952.

The previous prime is 40928509. The next prime is 40928567. The reversal of 40928521 is 12582904.

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 35569296 + 5359225 = 5964^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 40928521 - 2⁹ = 40928009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40928581) 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, 27186 + ... + 28651.

It is an arithmetic number, because the mean of its divisors is an integer number (10246273).

Almost surely, 2^40928521 is an apocalyptic number.

It is an amenable number.

40928521 is a deficient number, since it is larger than the sum of its proper divisors (56571).

40928521 is an equidigital number, since it uses as much as digits as its factorization.

40928521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56570.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 40928521 is about 6397.5402304323. The cubic root of 40928521 is about 344.6212211983.

The spelling of 40928521 in words is "forty million, nine hundred twenty-eight thousand, five hundred twenty-one".