40644521 has 8 divisors (see below), whose sum is σ = 41456064. Its totient is φ = 39841200.

The previous prime is 40644517. The next prime is 40644529. The reversal of 40644521 is 12544604.

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 40644521 - 2² = 40644517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40644529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8450 + ... + 12356.

It is an arithmetic number, because the mean of its divisors is an integer number (5182008).

Almost surely, 2^40644521 is an apocalyptic number.

It is an amenable number.

40644521 is a deficient number, since it is larger than the sum of its proper divisors (811543).

40644521 is a wasteful number, since it uses less digits than its factorization.

40644521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 40644521 is about 6375.3055613045. The cubic root of 40644521 is about 343.8222699399.

The spelling of 40644521 in words is "forty million, six hundred forty-four thousand, five hundred twenty-one".