1989120 has 160 divisors (see below), whose sum is σ = 7463808. Its totient is φ = 442368.

The previous prime is 1989107. The next prime is 1989131. The reversal of 1989120 is 219891.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53742 + ... + 53778.

2^1989120 is an apocalyptic number.

1989120 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 1989120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3731904).

1989120 is an abundant number, since it is smaller than the sum of its proper divisors (5474688).

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

1989120 is an equidigital number, since it uses as much as digits as its factorization.

1989120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1989120 is about 1410.3616557465. The cubic root of 1989120 is about 125.7632237647.

It can be divided in two parts, 1 and 989120, that added together give a triangular number (989121 = T₁₄₀₆).

The spelling of 1989120 in words is "one million, nine hundred eighty-nine thousand, one hundred twenty".