40816939 has 2 divisors, whose sum is σ = 40816940. Its totient is φ = 40816938.

The previous prime is 40816907. The next prime is 40816981. The reversal of 40816939 is 93961804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40816939 - 2⁵ = 40816907 is a prime.

It is not a weakly prime, because it can be changed into another prime (40816999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20408469 + 20408470.

It is an arithmetic number, because the mean of its divisors is an integer number (20408470).

Almost surely, 2^40816939 is an apocalyptic number.

40816939 is a deficient number, since it is larger than the sum of its proper divisors (1).

40816939 is an equidigital number, since it uses as much as digits as its factorization.

40816939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 40816939 is about 6388.8135831311. The cubic root of 40816939 is about 344.3077598921.

The spelling of 40816939 in words is "forty million, eight hundred sixteen thousand, nine hundred thirty-nine".