40872691 has 2 divisors, whose sum is σ = 40872692. Its totient is φ = 40872690.

The previous prime is 40872677. The next prime is 40872703. The reversal of 40872691 is 19627804.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40872691 - 2⁹ = 40872179 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40872691.

It is not a weakly prime, because it can be changed into another prime (40876691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20436345 + 20436346.

It is an arithmetic number, because the mean of its divisors is an integer number (20436346).

Almost surely, 2^40872691 is an apocalyptic number.

40872691 is a deficient number, since it is larger than the sum of its proper divisors (1).

40872691 is an equidigital number, since it uses as much as digits as its factorization.

40872691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 40872691 is about 6393.1753456322. The cubic root of 40872691 is about 344.4644522967.

The spelling of 40872691 in words is "forty million, eight hundred seventy-two thousand, six hundred ninety-one".