18709998 has 8 divisors (see below), whose sum is σ = 37420008. Its totient is φ = 6236664.

The previous prime is 18709993. The next prime is 18710009. The reversal of 18709998 is 89990781.

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

18709998 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18709998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18709993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1559161 + ... + 1559172.

It is an arithmetic number, because the mean of its divisors is an integer number (4677501).

Almost surely, 2^18709998 is an apocalyptic number.

18709998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18709998 is a wasteful number, since it uses less digits than its factorization.

18709998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3118338.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 18709998 is about 4325.5055195896. The cubic root of 18709998 is about 265.4755812569.

The spelling of 18709998 in words is "eighteen million, seven hundred nine thousand, nine hundred ninety-eight".