18703989 has 6 divisors (see below), whose sum is σ = 27016886. Its totient is φ = 12469320.

The previous prime is 18703969. The next prime is 18704041. The reversal of 18703989 is 98930781.

It can be written as a sum of positive squares in only one way, i.e., 11168964 + 7535025 = 3342^2 + 2745^2 .

It is not a de Polignac number, because 18703989 - 2¹¹ = 18701941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18703969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1039102 + ... + 1039119.

Almost surely, 2^18703989 is an apocalyptic number.

It is an amenable number.

18703989 is a deficient number, since it is larger than the sum of its proper divisors (8312897).

18703989 is a wasteful number, since it uses less digits than its factorization.

18703989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078227 (or 2078224 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18703989 is about 4324.8108629164. The cubic root of 18703989 is about 265.4471577089.

The spelling of 18703989 in words is "eighteen million, seven hundred three thousand, nine hundred eighty-nine".