18013995 has 40 divisors (see below), whose sum is σ = 34005840. Its totient is φ = 9097920.

The previous prime is 18013987. The next prime is 18013997. The reversal of 18013995 is 59931081.

It is a happy number.

It is not a de Polignac number, because 18013995 - 2³ = 18013987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18013997) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6525 + ... + 8865.

It is an arithmetic number, because the mean of its divisors is an integer number (850146).

Almost surely, 2^18013995 is an apocalyptic number.

18013995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18013995 is a deficient number, since it is larger than the sum of its proper divisors (15991845).

18013995 is a wasteful number, since it uses less digits than its factorization.

18013995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377 (or 2368 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 18013995 is about 4244.2896932231. The cubic root of 18013995 is about 262.1420427068.

The spelling of 18013995 in words is "eighteen million, thirteen thousand, nine hundred ninety-five".