1998570 has 64 divisors (see below), whose sum is σ = 5677056. Its totient is φ = 440640.

The previous prime is 1998569. The next prime is 1998587. The reversal of 1998570 is 758991.

It is a happy number.

It is a Curzon number.

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, 6357 + ... + 6663.

It is an arithmetic number, because the mean of its divisors is an integer number (88704).

2^1998570 is an apocalyptic number.

1998570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2838528).

1998570 is an abundant number, since it is smaller than the sum of its proper divisors (3678486).

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

1998570 is a wasteful number, since it uses less digits than its factorization.

1998570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 1998570 is about 1413.7078906196. The cubic root of 1998570 is about 125.9620697116.

It can be divided in two parts, 19 and 98570, that added together give a palindrome (98589).

The spelling of 1998570 in words is "one million, nine hundred ninety-eight thousand, five hundred seventy".