1998870 has 16 divisors (see below), whose sum is σ = 4797360. Its totient is φ = 533024.

The previous prime is 1998839. The next prime is 1998881. The reversal of 1998870 is 788991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33285 + ... + 33344.

It is an arithmetic number, because the mean of its divisors is an integer number (299835).

2^1998870 is an apocalyptic number.

1998870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998870 is an abundant number, since it is smaller than the sum of its proper divisors (2798490).

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

1998870 is a wasteful number, since it uses less digits than its factorization.

1998870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66639.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1998870 is about 1413.8139905942. The cubic root of 1998870 is about 125.9683720061.

It can be divided in two parts, 19 and 98870, that added together give a palindrome (98889).

The spelling of 1998870 in words is "one million, nine hundred ninety-eight thousand, eight hundred seventy".