18941387 has 2 divisors, whose sum is σ = 18941388. Its totient is φ = 18941386.

The previous prime is 18941359. The next prime is 18941393. The reversal of 18941387 is 78314981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18941387 - 2⁶ = 18941323 is a prime.

It is a super-2 number, since 2×18941387² = 717552282967538, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18941317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9470693 + 9470694.

It is an arithmetic number, because the mean of its divisors is an integer number (9470694).

Almost surely, 2^18941387 is an apocalyptic number.

18941387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18941387 is an equidigital number, since it uses as much as digits as its factorization.

18941387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 18941387 is about 4352.1703780987. The cubic root of 18941387 is about 266.5654909582.

The spelling of 18941387 in words is "eighteen million, nine hundred forty-one thousand, three hundred eighty-seven".