18198612 has 72 divisors (see below), whose sum is σ = 49620480. Its totient is φ = 5607360.

The previous prime is 18198611. The next prime is 18198613. The reversal of 18198612 is 21689181.

It is an interprime number because it is at equal distance from previous prime (18198611) and next prime (18198613).

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (6912) is a multiple of the sum of its prime divisors (768).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25314 + ... + 26022.

Almost surely, 2^18198612 is an apocalyptic number.

18198612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18198612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24810240).

18198612 is an abundant number, since it is smaller than the sum of its proper divisors (31421868).

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

18198612 is a wasteful number, since it uses less digits than its factorization.

18198612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 768 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 18198612 is about 4265.9831223295. The cubic root of 18198612 is about 263.0345244234.

The spelling of 18198612 in words is "eighteen million, one hundred ninety-eight thousand, six hundred twelve".