18398542 has 8 divisors (see below), whose sum is σ = 27664632. Its totient is φ = 9177000.

The previous prime is 18398521. The next prime is 18398561. The reversal of 18398542 is 24589381.

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

It is a junction number, because it is equal to n+sod(n) for n = 18398495 and 18398504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10084 + ... + 11767.

It is an arithmetic number, because the mean of its divisors is an integer number (3458079).

Almost surely, 2^18398542 is an apocalyptic number.

18398542 is a deficient number, since it is larger than the sum of its proper divisors (9266090).

18398542 is a wasteful number, since it uses less digits than its factorization.

18398542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22274.

The product of its digits is 69120, while the sum is 40.

The square root of 18398542 is about 4289.3521655374. The cubic root of 18398542 is about 263.9942510992.

The spelling of 18398542 in words is "eighteen million, three hundred ninety-eight thousand, five hundred forty-two".