18731890327 has 2 divisors, whose sum is σ = 18731890328. Its totient is φ = 18731890326.

The previous prime is 18731890321. The next prime is 18731890363. The reversal of 18731890327 is 72309813781.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18731890327 - 2³ = 18731890319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18731890321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9365945163 + 9365945164.

It is an arithmetic number, because the mean of its divisors is an integer number (9365945164).

Almost surely, 2^18731890327 is an apocalyptic number.

18731890327 is a deficient number, since it is larger than the sum of its proper divisors (1).

18731890327 is an equidigital number, since it uses as much as digits as its factorization.

18731890327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 18731890327 in words is "eighteen billion, seven hundred thirty-one million, eight hundred ninety thousand, three hundred twenty-seven".