18868137 has 4 divisors (see below), whose sum is σ = 25157520. Its totient is φ = 12578756.

The previous prime is 18868133. The next prime is 18868139. The reversal of 18868137 is 73186881.

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: 73186881 = 3 ⋅24395627.

It is a cyclic number.

It is not a de Polignac number, because 18868137 - 2² = 18868133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18868133) 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, 3144687 + ... + 3144692.

It is an arithmetic number, because the mean of its divisors is an integer number (6289380).

Almost surely, 2^18868137 is an apocalyptic number.

It is an amenable number.

18868137 is a deficient number, since it is larger than the sum of its proper divisors (6289383).

18868137 is an equidigital number, since it uses as much as digits as its factorization.

18868137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289382.

The product of its digits is 64512, while the sum is 42.

The square root of 18868137 is about 4343.7468848910. The cubic root of 18868137 is about 266.2214269851.

The spelling of 18868137 in words is "eighteen million, eight hundred sixty-eight thousand, one hundred thirty-seven".