40809515 has 4 divisors (see below), whose sum is σ = 48971424. Its totient is φ = 32647608.

The previous prime is 40809493. The next prime is 40809529. The reversal of 40809515 is 51590804.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40809515 - 2²² = 36615211 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4080947 + ... + 4080956.

It is an arithmetic number, because the mean of its divisors is an integer number (12242856).

Almost surely, 2^40809515 is an apocalyptic number.

40809515 is a deficient number, since it is larger than the sum of its proper divisors (8161909).

40809515 is an equidigital number, since it uses as much as digits as its factorization.

40809515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8161908.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 40809515 is about 6388.2325411650. The cubic root of 40809515 is about 344.2868837897.

The spelling of 40809515 in words is "forty million, eight hundred nine thousand, five hundred fifteen".