1989240 has 96 divisors (see below), whose sum is σ = 6607440. Its totient is φ = 478720.

The previous prime is 1989233. The next prime is 1989241. The reversal of 1989240 is 429891.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14452 + ... + 14588.

2^1989240 is an apocalyptic number.

1989240 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 1989240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3303720).

1989240 is an abundant number, since it is smaller than the sum of its proper divisors (4618200).

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

1989240 is a wasteful number, since it uses less digits than its factorization.

1989240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1989240 is about 1410.4041973846. The cubic root of 1989240 is about 125.7657527362.

The spelling of 1989240 in words is "one million, nine hundred eighty-nine thousand, two hundred forty".