18142855 has 4 divisors (see below), whose sum is σ = 21771432. Its totient is φ = 14514280.

The previous prime is 18142823. The next prime is 18142867. The reversal of 18142855 is 55824181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18142855 - 2⁵ = 18142823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18142855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814281 + ... + 1814290.

It is an arithmetic number, because the mean of its divisors is an integer number (5442858).

Almost surely, 2^18142855 is an apocalyptic number.

18142855 is a deficient number, since it is larger than the sum of its proper divisors (3628577).

18142855 is an equidigital number, since it uses as much as digits as its factorization.

18142855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3628576.

The product of its digits is 12800, while the sum is 34.

The square root of 18142855 is about 4259.4430387082. The cubic root of 18142855 is about 262.7656207754.

The spelling of 18142855 in words is "eighteen million, one hundred forty-two thousand, eight hundred fifty-five".