18938089 has 4 divisors (see below), whose sum is σ = 18979456. Its totient is φ = 18896724.

The previous prime is 18938083. The next prime is 18938093. The reversal of 18938089 is 98083981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98083981 = 521 ⋅188261.

It is a cyclic number.

It is not a de Polignac number, because 18938089 - 2³ = 18938081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18938081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19989 + ... + 20914.

It is an arithmetic number, because the mean of its divisors is an integer number (4744864).

Almost surely, 2^18938089 is an apocalyptic number.

It is an amenable number.

18938089 is a deficient number, since it is larger than the sum of its proper divisors (41367).

18938089 is an equidigital number, since it uses as much as digits as its factorization.

18938089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41366.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 18938089 is about 4351.7914701879. The cubic root of 18938089 is about 266.5500189476.

The spelling of 18938089 in words is "eighteen million, nine hundred thirty-eight thousand, eighty-nine".