18142147 has 4 divisors (see below), whose sum is σ = 18930960. Its totient is φ = 17353336.

The previous prime is 18142129. The next prime is 18142151. The reversal of 18142147 is 74124181.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18142147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18142127) 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, 394372 + ... + 394417.

It is an arithmetic number, because the mean of its divisors is an integer number (4732740).

Almost surely, 2^18142147 is an apocalyptic number.

18142147 is a deficient number, since it is larger than the sum of its proper divisors (788813).

18142147 is an equidigital number, since it uses as much as digits as its factorization.

18142147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788812.

The product of its digits is 1792, while the sum is 28.

The square root of 18142147 is about 4259.3599284400. The cubic root of 18142147 is about 262.7622027085.

The spelling of 18142147 in words is "eighteen million, one hundred forty-two thousand, one hundred forty-seven".