18087995 has 4 divisors (see below), whose sum is σ = 21705600. Its totient is φ = 14470392.

The previous prime is 18087991. The next prime is 18088027. The reversal of 18087995 is 59978081.

It is a happy number.

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 18087995 - 2² = 18087991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18087991) 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, 1808795 + ... + 1808804.

It is an arithmetic number, because the mean of its divisors is an integer number (5426400).

Almost surely, 2^18087995 is an apocalyptic number.

18087995 is a deficient number, since it is larger than the sum of its proper divisors (3617605).

18087995 is an equidigital number, since it uses as much as digits as its factorization.

18087995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617604.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 18087995 is about 4252.9983541027. The cubic root of 18087995 is about 262.5005049121.

The spelling of 18087995 in words is "eighteen million, eighty-seven thousand, nine hundred ninety-five".