18118042 has 4 divisors (see below), whose sum is σ = 27177066. Its totient is φ = 9059020.

The previous prime is 18118033. The next prime is 18118057. The reversal of 18118042 is 24081181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24081181 = 1657 ⋅14533.

It can be written as a sum of positive squares in only one way, i.e., 17397241 + 720801 = 4171^2 + 849^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18117998 and 18118016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4529509 + ... + 4529512.

Almost surely, 2^18118042 is an apocalyptic number.

18118042 is a deficient number, since it is larger than the sum of its proper divisors (9059024).

18118042 is an equidigital number, since it uses as much as digits as its factorization.

18118042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9059023.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 18118042 is about 4256.5293373827. The cubic root of 18118042 is about 262.6457760218.

The spelling of 18118042 in words is "eighteen million, one hundred eighteen thousand, forty-two".