1998612 has 108 divisors (see below), whose sum is σ = 6473376. Its totient is φ = 514080.

The previous prime is 1998611. The next prime is 1998617. The reversal of 1998612 is 2168991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998611) 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 35 ways as a sum of consecutive naturals, for example, 19353 + ... + 19455.

2^1998612 is an apocalyptic number.

1998612 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 1998612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3236688).

1998612 is an abundant number, since it is smaller than the sum of its proper divisors (4474764).

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

1998612 is a wasteful number, since it uses less digits than its factorization.

1998612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 126 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 1998612 is about 1413.7227450954. The cubic root of 1998612 is about 125.9629520708.

The spelling of 1998612 in words is "one million, nine hundred ninety-eight thousand, six hundred twelve".