40289521 has 4 divisors (see below), whose sum is σ = 40380912. Its totient is φ = 40198132.

The previous prime is 40289489. The next prime is 40289527. The reversal of 40289521 is 12598204.

40289521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40289521 - 2⁵ = 40289489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40289527) by changing a digit.

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, 45031 + ... + 45916.

It is an arithmetic number, because the mean of its divisors is an integer number (10095228).

Almost surely, 2^40289521 is an apocalyptic number.

It is an amenable number.

40289521 is a deficient number, since it is larger than the sum of its proper divisors (91391).

40289521 is an equidigital number, since it uses as much as digits as its factorization.

40289521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91390.

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

The square root of 40289521 is about 6347.4026971668. The cubic root of 40289521 is about 342.8183297912.

The spelling of 40289521 in words is "forty million, two hundred eighty-nine thousand, five hundred twenty-one".