1990144 has 60 divisors (see below), whose sum is σ = 4493016. Its totient is φ = 878592.

The previous prime is 1990141. The next prime is 1990147. The reversal of 1990144 is 4410991.

It is an interprime number because it is at equal distance from previous prime (1990141) and next prime (1990147).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86517 + ... + 86539.

2^1990144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1990144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2246508).

1990144 is an abundant number, since it is smaller than the sum of its proper divisors (2502872).

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

1990144 is an equidigital number, since it uses as much as digits as its factorization.

1990144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1990144 is about 1410.7246364901. The cubic root of 1990144 is about 125.7848010533.

The spelling of 1990144 in words is "one million, nine hundred ninety thousand, one hundred forty-four".