40659691 has 4 divisors (see below), whose sum is σ = 40672800. Its totient is φ = 40646584.

The previous prime is 40659629. The next prime is 40659719. The reversal of 40659691 is 19695604.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40659691 - 2¹⁷ = 40528619 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40659191) 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, 1005 + ... + 9073.

It is an arithmetic number, because the mean of its divisors is an integer number (10168200).

Almost surely, 2^40659691 is an apocalyptic number.

40659691 is a deficient number, since it is larger than the sum of its proper divisors (13109).

40659691 is an equidigital number, since it uses as much as digits as its factorization.

40659691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13108.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 40659691 is about 6376.4951972067. The cubic root of 40659691 is about 343.8650402399.

The spelling of 40659691 in words is "forty million, six hundred fifty-nine thousand, six hundred ninety-one".