18349042 has 4 divisors (see below), whose sum is σ = 27523566. Its totient is φ = 9174520.

The previous prime is 18349031. The next prime is 18349043. The reversal of 18349042 is 24094381.

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., 17799961 + 549081 = 4219^2 + 741^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18348995 and 18349013.

It is not an unprimeable number, because it can be changed into a prime (18349043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4587259 + ... + 4587262.

Almost surely, 2^18349042 is an apocalyptic number.

18349042 is a deficient number, since it is larger than the sum of its proper divisors (9174524).

18349042 is an equidigital number, since it uses as much as digits as its factorization.

18349042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9174523.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 18349042 is about 4283.5781771785. The cubic root of 18349042 is about 263.7572857237.

The spelling of 18349042 in words is "eighteen million, three hundred forty-nine thousand, forty-two".