18994998 has 32 divisors (see below), whose sum is σ = 41633280. Its totient is φ = 5729760.

The previous prime is 18994981. The next prime is 18994999. The reversal of 18994998 is 89949981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994999) 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 15 ways as a sum of consecutive naturals, for example, 17763 + ... + 18801.

It is an arithmetic number, because the mean of its divisors is an integer number (1301040).

Almost surely, 2^18994998 is an apocalyptic number.

18994998 is an abundant number, since it is smaller than the sum of its proper divisors (22638282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18994998 is a wasteful number, since it uses less digits than its factorization.

18994998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332.

The product of its digits is 1679616, while the sum is 57.

The square root of 18994998 is about 4358.3251370222. The cubic root of 18994998 is about 266.8167464222.

The spelling of 18994998 in words is "eighteen million, nine hundred ninety-four thousand, nine hundred ninety-eight".