18010042 has 4 divisors (see below), whose sum is σ = 27015066. Its totient is φ = 9005020.

The previous prime is 18010037. The next prime is 18010051. The reversal of 18010042 is 24001081.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 15217801 + 2792241 = 3901^2 + 1671^2 .

It is a super-2 number, since 2×18010042² = 648723225683528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18009998 and 18010025.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4502509 + ... + 4502512.

Almost surely, 2^18010042 is an apocalyptic number.

18010042 is a deficient number, since it is larger than the sum of its proper divisors (9005024).

18010042 is an equidigital number, since it uses as much as digits as its factorization.

18010042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9005023.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 18010042 is about 4243.8239831548. The cubic root of 18010042 is about 262.1228664441.

The spelling of 18010042 in words is "eighteen million, ten thousand, forty-two".