18037889 has 2 divisors, whose sum is σ = 18037890. Its totient is φ = 18037888.

The previous prime is 18037879. The next prime is 18037919. The reversal of 18037889 is 98873081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17707264 + 330625 = 4208^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 18037889 - 2⁸ = 18037633 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18037879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9018944 + 9018945.

It is an arithmetic number, because the mean of its divisors is an integer number (9018945).

Almost surely, 2^18037889 is an apocalyptic number.

It is an amenable number.

18037889 is a deficient number, since it is larger than the sum of its proper divisors (1).

18037889 is an equidigital number, since it uses as much as digits as its factorization.

18037889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 18037889 is about 4247.1036012793. The cubic root of 18037889 is about 262.2578943844.

The spelling of 18037889 in words is "eighteen million, thirty-seven thousand, eight hundred eighty-nine".