18106998 has 48 divisors (see below), whose sum is σ = 44833536. Its totient is φ = 4773600.

The previous prime is 18106997. The next prime is 18107009. The reversal of 18106998 is 89960181.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18106997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5823 + ... + 8373.

It is an arithmetic number, because the mean of its divisors is an integer number (934032).

Almost surely, 2^18106998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18106998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22416768).

18106998 is an abundant number, since it is smaller than the sum of its proper divisors (26726538).

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

18106998 is a wasteful number, since it uses less digits than its factorization.

18106998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589 (or 2576 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 18106998 is about 4255.2318385724. The cubic root of 18106998 is about 262.5923992180.

The spelling of 18106998 in words is "eighteen million, one hundred six thousand, nine hundred ninety-eight".