18840791 has 2 divisors, whose sum is σ = 18840792. Its totient is φ = 18840790.

The previous prime is 18840763. The next prime is 18840793. The reversal of 18840791 is 19704881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18840791 - 2⁶ = 18840727 is a prime.

Together with 18840793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18840793) 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, 9420395 + 9420396.

It is an arithmetic number, because the mean of its divisors is an integer number (9420396).

Almost surely, 2^18840791 is an apocalyptic number.

18840791 is a deficient number, since it is larger than the sum of its proper divisors (1).

18840791 is an equidigital number, since it uses as much as digits as its factorization.

18840791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18840791 is about 4340.5980002760. The cubic root of 18840791 is about 266.0927513057.

The spelling of 18840791 in words is "eighteen million, eight hundred forty thousand, seven hundred ninety-one".