18722998 has 24 divisors (see below), whose sum is σ = 32823792. Its totient is φ = 8009736.

The previous prime is 18722987. The next prime is 18723011. The reversal of 18722998 is 89922781.

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 11 ways as a sum of consecutive naturals, for example, 33336 + ... + 33892.

It is an arithmetic number, because the mean of its divisors is an integer number (1367658).

Almost surely, 2^18722998 is an apocalyptic number.

18722998 is a deficient number, since it is larger than the sum of its proper divisors (14100794).

18722998 is an frugal number, since it uses more digits than its factorization.

18722998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 566 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 18722998 is about 4327.0079731842. The cubic root of 18722998 is about 265.5370525543.

The spelling of 18722998 in words is "eighteen million, seven hundred twenty-two thousand, nine hundred ninety-eight".