18999242 has 8 divisors (see below), whose sum is σ = 29738016. Its totient is φ = 9086572.

The previous prime is 18999209. The next prime is 18999247. The reversal of 18999242 is 24299981.

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 = 18999193 and 18999202.

It is not an unprimeable number, because it can be changed into a prime (18999247) by changing a digit.

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, 206468 + ... + 206559.

It is an arithmetic number, because the mean of its divisors is an integer number (3717252).

Almost surely, 2^18999242 is an apocalyptic number.

18999242 is a deficient number, since it is larger than the sum of its proper divisors (10738774).

18999242 is a wasteful number, since it uses less digits than its factorization.

18999242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413052.

The product of its digits is 93312, while the sum is 44.

The square root of 18999242 is about 4358.8119941103. The cubic root of 18999242 is about 266.8366163190.

The spelling of 18999242 in words is "eighteen million, nine hundred ninety-nine thousand, two hundred forty-two".