1989700 has 36 divisors (see below), whose sum is σ = 4382532. Its totient is φ = 784000.

The previous prime is 1989683. The next prime is 1989721. The reversal of 1989700 is 79891.

It can be written as a sum of positive squares in 6 ways, for example, as 412164 + 1577536 = 642^2 + 1256^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10002 + ... + 10198.

It is an arithmetic number, because the mean of its divisors is an integer number (121737).

2^1989700 is an apocalyptic number.

1989700 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 1989700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2191266).

1989700 is an abundant number, since it is smaller than the sum of its proper divisors (2392832).

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

1989700 is a wasteful number, since it uses less digits than its factorization.

1989700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1989700 is about 1410.5672617780. The cubic root of 1989700 is about 125.7754461849.

The spelling of 1989700 in words is "one million, nine hundred eighty-nine thousand, seven hundred".