40708391 has 2 divisors, whose sum is σ = 40708392. Its totient is φ = 40708390.

The previous prime is 40708361. The next prime is 40708417. The reversal of 40708391 is 19380704.

40708391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40708391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40708331) 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 as a sum of consecutive naturals, namely, 20354195 + 20354196.

It is an arithmetic number, because the mean of its divisors is an integer number (20354196).

Almost surely, 2^40708391 is an apocalyptic number.

40708391 is a deficient number, since it is larger than the sum of its proper divisors (1).

40708391 is an equidigital number, since it uses as much as digits as its factorization.

40708391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 40708391 is about 6380.3127666283. The cubic root of 40708391 is about 344.0022731732.

The spelling of 40708391 in words is "forty million, seven hundred eight thousand, three hundred ninety-one".