1989750 has 64 divisors (see below), whose sum is σ = 5690880. Its totient is φ = 453600.

The previous prime is 1989721. The next prime is 1989769. The reversal of 1989750 is 579891.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1989699 and 1989708.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 5061 + ... + 5439.

It is an arithmetic number, because the mean of its divisors is an integer number (88920).

2^1989750 is an apocalyptic number.

1989750 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 1989750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2845440).

1989750 is an abundant number, since it is smaller than the sum of its proper divisors (3701130).

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

1989750 is a wasteful number, since it uses less digits than its factorization.

1989750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 396 counting only the distinct ones).

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

The square root of 1989750 is about 1410.5849850328. The cubic root of 1989750 is about 125.7764997306.

The spelling of 1989750 in words is "one million, nine hundred eighty-nine thousand, seven hundred fifty".