40697591 has 4 divisors (see below), whose sum is σ = 44397384. Its totient is φ = 36997800.

The previous prime is 40697567. The next prime is 40697593. The reversal of 40697591 is 19579604.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40697591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40697593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1849880 + ... + 1849901.

It is an arithmetic number, because the mean of its divisors is an integer number (11099346).

Almost surely, 2^40697591 is an apocalyptic number.

40697591 is a deficient number, since it is larger than the sum of its proper divisors (3699793).

40697591 is a wasteful number, since it uses less digits than its factorization.

40697591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3699792.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 40697591 is about 6379.4663569926. The cubic root of 40697591 is about 343.9718490349.

The spelling of 40697591 in words is "forty million, six hundred ninety-seven thousand, five hundred ninety-one".