18042499 has 8 divisors (see below), whose sum is σ = 18608832. Its totient is φ = 17482920.

The previous prime is 18042487. The next prime is 18042503. The reversal of 18042499 is 99424081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18042499 - 2⁹ = 18041987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18042469) 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 in 7 ways as a sum of consecutive naturals, for example, 4032 + ... + 7234.

It is an arithmetic number, because the mean of its divisors is an integer number (2326104).

Almost surely, 2^18042499 is an apocalyptic number.

18042499 is a deficient number, since it is larger than the sum of its proper divisors (566333).

18042499 is a wasteful number, since it uses less digits than its factorization.

18042499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 18042499 is about 4247.6462894172. The cubic root of 18042499 is about 262.2802345062.

The spelling of 18042499 in words is "eighteen million, forty-two thousand, four hundred ninety-nine".