18418937 has 4 divisors (see below), whose sum is σ = 18564096. Its totient is φ = 18273780.

The previous prime is 18418927. The next prime is 18418943. The reversal of 18418937 is 73981481.

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.

It is a cyclic number.

It is not a de Polignac number, because 18418937 - 2²⁴ = 1641721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18418894 and 18418903.

It is not an unprimeable number, because it can be changed into a prime (18418927) 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, 72389 + ... + 72642.

It is an arithmetic number, because the mean of its divisors is an integer number (4641024).

Almost surely, 2^18418937 is an apocalyptic number.

It is an amenable number.

18418937 is a deficient number, since it is larger than the sum of its proper divisors (145159).

18418937 is a wasteful number, since it uses less digits than its factorization.

18418937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145158.

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

The square root of 18418937 is about 4291.7289056976. The cubic root of 18418937 is about 264.0917619872.

The spelling of 18418937 in words is "eighteen million, four hundred eighteen thousand, nine hundred thirty-seven".