1989888 has 36 divisors (see below), whose sum is σ = 5298048. Its totient is φ = 663040.

The previous prime is 1989877. The next prime is 1989899. The reversal of 1989888 is 8889891.

It is an interprime number because it is at equal distance from previous prime (1989877) and next prime (1989899).

It is a self number, because there is not a number n which added to its sum of digits gives 1989888.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528 + ... + 2063.

It is an arithmetic number, because the mean of its divisors is an integer number (147168).

2^1989888 is an apocalyptic number.

It is an amenable number.

1989888 is an abundant number, since it is smaller than the sum of its proper divisors (3308160).

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

1989888 is an equidigital number, since it uses as much as digits as its factorization.

1989888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610 (or 2596 counting only the distinct ones).

The product of its digits is 331776, while the sum is 51.

The square root of 1989888 is about 1410.6339000605. The cubic root of 1989888 is about 125.7794074251.

The spelling of 1989888 in words is "one million, nine hundred eighty-nine thousand, eight hundred eighty-eight".