18137047 has 4 divisors (see below), whose sum is σ = 18579456. Its totient is φ = 17694640.

The previous prime is 18137033. The next prime is 18137051. The reversal of 18137047 is 74073181.

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 18137047 - 2¹¹ = 18134999 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18137017) 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, 221143 + ... + 221224.

It is an arithmetic number, because the mean of its divisors is an integer number (4644864).

Almost surely, 2^18137047 is an apocalyptic number.

18137047 is a deficient number, since it is larger than the sum of its proper divisors (442409).

18137047 is an equidigital number, since it uses as much as digits as its factorization.

18137047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442408.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 18137047 is about 4258.7612048576. The cubic root of 18137047 is about 262.7375784119.

The spelling of 18137047 in words is "eighteen million, one hundred thirty-seven thousand, forty-seven".