1998000 has 160 divisors (see below), whose sum is σ = 7350720. Its totient is φ = 518400.

The previous prime is 1997999. The next prime is 1998019. The reversal of 1998000 is 8991.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53982 + ... + 54018.

It is an arithmetic number, because the mean of its divisors is an integer number (45942).

2^1998000 is an apocalyptic number.

1998000 is a gapful number since it is divisible by the number (10) 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 1998000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3675360).

1998000 is an abundant number, since it is smaller than the sum of its proper divisors (5352720).

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

1998000 is a wasteful number, since it uses less digits than its factorization.

1998000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1998000 is about 1413.5062787268. The cubic root of 1998000 is about 125.9500936143.

It can be divided in two parts, 1 and 998000, that added together give a square (998001 = 999²).

The spelling of 1998000 in words is "one million, nine hundred ninety-eight thousand".