40913609 has 16 divisors (see below), whose sum is σ = 45852480. Its totient is φ = 36493600.

The previous prime is 40913603. The next prime is 40913623. The reversal of 40913609 is 90631904.

It is not a de Polignac number, because 40913609 - 2²⁴ = 24136393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40913603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78269 + ... + 78789.

It is an arithmetic number, because the mean of its divisors is an integer number (2865780).

Almost surely, 2^40913609 is an apocalyptic number.

It is an amenable number.

40913609 is a deficient number, since it is larger than the sum of its proper divisors (4938871).

40913609 is an equidigital number, since it uses as much as digits as its factorization.

40913609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 40913609 is about 6396.3746763303. The cubic root of 40913609 is about 344.5793627276.

The spelling of 40913609 in words is "forty million, nine hundred thirteen thousand, six hundred nine".