18313087 has 4 divisors (see below), whose sum is σ = 19721800. Its totient is φ = 16904376.

The previous prime is 18313081. The next prime is 18313103. The reversal of 18313087 is 78031381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78031381 = 79 ⋅987739.

It is a cyclic number.

It is not a de Polignac number, because 18313087 - 2¹¹ = 18311039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18313081) 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, 704337 + ... + 704362.

It is an arithmetic number, because the mean of its divisors is an integer number (4930450).

Almost surely, 2^18313087 is an apocalyptic number.

18313087 is a deficient number, since it is larger than the sum of its proper divisors (1408713).

18313087 is a wasteful number, since it uses less digits than its factorization.

18313087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408712.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18313087 is about 4279.3792774186. The cubic root of 18313087 is about 263.5848953576.

The spelling of 18313087 in words is "eighteen million, three hundred thirteen thousand, eighty-seven".