1989253 has 6 divisors (see below), whose sum is σ = 2314086. Its totient is φ = 1705032.

The previous prime is 1989241. The next prime is 1989259. The reversal of 1989253 is 3529891.

It can be written as a sum of positive squares in only one way, i.e., 1979649 + 9604 = 1407^2 + 98^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1989253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20250 + ... + 20347.

It is an arithmetic number, because the mean of its divisors is an integer number (385681).

2^1989253 is an apocalyptic number.

It is an amenable number.

1989253 is a deficient number, since it is larger than the sum of its proper divisors (324833).

1989253 is an equidigital number, since it uses as much as digits as its factorization.

1989253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40611 (or 40604 counting only the distinct ones).

The product of its digits is 19440, while the sum is 37.

The square root of 1989253 is about 1410.4088059850. The cubic root of 1989253 is about 125.7660267020.

The spelling of 1989253 in words is "one million, nine hundred eighty-nine thousand, two hundred fifty-three".