18149542 has 4 divisors (see below), whose sum is σ = 27224316. Its totient is φ = 9074770.

The previous prime is 18149531. The next prime is 18149543. The reversal of 18149542 is 24594181.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 18149498 and 18149507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18149543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4537384 + ... + 4537387.

It is an arithmetic number, because the mean of its divisors is an integer number (6806079).

Almost surely, 2^18149542 is an apocalyptic number.

18149542 is a deficient number, since it is larger than the sum of its proper divisors (9074774).

18149542 is an equidigital number, since it uses as much as digits as its factorization.

18149542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9074773.

The product of its digits is 11520, while the sum is 34.

The square root of 18149542 is about 4260.2279281747. The cubic root of 18149542 is about 262.7978997428.

The spelling of 18149542 in words is "eighteen million, one hundred forty-nine thousand, five hundred forty-two".