40908691 has 4 divisors (see below), whose sum is σ = 43061800. Its totient is φ = 38755584.

The previous prime is 40908667. The next prime is 40908701. The reversal of 40908691 is 19680904.

40908691 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.

It is a cyclic number.

It is not a de Polignac number, because 40908691 - 2⁷ = 40908563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40908691.

It is not an unprimeable number, because it can be changed into a prime (40908601) 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, 1076526 + ... + 1076563.

It is an arithmetic number, because the mean of its divisors is an integer number (10765450).

Almost surely, 2^40908691 is an apocalyptic number.

40908691 is a deficient number, since it is larger than the sum of its proper divisors (2153109).

40908691 is a wasteful number, since it uses less digits than its factorization.

40908691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153108.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 40908691 is about 6395.9902282602. The cubic root of 40908691 is about 344.5655555108.

The spelling of 40908691 in words is "forty million, nine hundred eight thousand, six hundred ninety-one".