18315047 has 4 divisors (see below), whose sum is σ = 18324576. Its totient is φ = 18305520.

The previous prime is 18315023. The next prime is 18315049. The reversal of 18315047 is 74051381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18315047 - 2⁶ = 18314983 is a prime.

It is a super-2 number, since 2×18315047² = 670881893224418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18315049) 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, 758 + ... + 6099.

It is an arithmetic number, because the mean of its divisors is an integer number (4581144).

Almost surely, 2^18315047 is an apocalyptic number.

18315047 is a deficient number, since it is larger than the sum of its proper divisors (9529).

18315047 is an equidigital number, since it uses as much as digits as its factorization.

18315047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9528.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 18315047 is about 4279.6082764664. The cubic root of 18315047 is about 263.5942986141.

The spelling of 18315047 in words is "eighteen million, three hundred fifteen thousand, forty-seven".