18012142 has 4 divisors (see below), whose sum is σ = 27018216. Its totient is φ = 9006070.

The previous prime is 18012131. The next prime is 18012143. The reversal of 18012142 is 24121081.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4503034 + ... + 4503037.

It is an arithmetic number, because the mean of its divisors is an integer number (6754554).

Almost surely, 2^18012142 is an apocalyptic number.

18012142 is a deficient number, since it is larger than the sum of its proper divisors (9006074).

18012142 is an equidigital number, since it uses as much as digits as its factorization.

18012142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9006073.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 18012142 is about 4244.0713943099. The cubic root of 18012142 is about 262.1330540314.

The spelling of 18012142 in words is "eighteen million, twelve thousand, one hundred forty-two".