18512147 has 4 divisors (see below), whose sum is σ = 18634896. Its totient is φ = 18389400.

The previous prime is 18512113. The next prime is 18512161. The reversal of 18512147 is 74121581.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18512147 - 2¹² = 18508051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18512107) 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, 61148 + ... + 61449.

It is an arithmetic number, because the mean of its divisors is an integer number (4658724).

Almost surely, 2^18512147 is an apocalyptic number.

18512147 is a deficient number, since it is larger than the sum of its proper divisors (122749).

18512147 is a wasteful number, since it uses less digits than its factorization.

18512147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122748.

The product of its digits is 2240, while the sum is 29.

The square root of 18512147 is about 4302.5744618774. The cubic root of 18512147 is about 264.5364960485.

The spelling of 18512147 in words is "eighteen million, five hundred twelve thousand, one hundred forty-seven".