40297891 has 2 divisors, whose sum is σ = 40297892. Its totient is φ = 40297890.

The previous prime is 40297877. The next prime is 40297903. The reversal of 40297891 is 19879204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40297891 - 2⁹ = 40297379 is a prime.

It is not a weakly prime, because it can be changed into another prime (40297091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20148945 + 20148946.

It is an arithmetic number, because the mean of its divisors is an integer number (20148946).

Almost surely, 2^40297891 is an apocalyptic number.

40297891 is a deficient number, since it is larger than the sum of its proper divisors (1).

40297891 is an equidigital number, since it uses as much as digits as its factorization.

40297891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 40297891 is about 6348.0619877251. The cubic root of 40297891 is about 342.8420678970.

The spelling of 40297891 in words is "forty million, two hundred ninety-seven thousand, eight hundred ninety-one".