40864891 has 2 divisors, whose sum is σ = 40864892. Its totient is φ = 40864890.

The previous prime is 40864853. The next prime is 40864897. The reversal of 40864891 is 19846804.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40864891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40864897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20432445 + 20432446.

It is an arithmetic number, because the mean of its divisors is an integer number (20432446).

Almost surely, 2^40864891 is an apocalyptic number.

40864891 is a deficient number, since it is larger than the sum of its proper divisors (1).

40864891 is an equidigital number, since it uses as much as digits as its factorization.

40864891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 40864891 is about 6392.5652910236. The cubic root of 40864891 is about 344.4425387762.

The spelling of 40864891 in words is "forty million, eight hundred sixty-four thousand, eight hundred ninety-one".