1989213 has 4 divisors (see below), whose sum is σ = 2652288. Its totient is φ = 1326140.

The previous prime is 1989203. The next prime is 1989217. The reversal of 1989213 is 3129891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1989213 - 2¹⁴ = 1972829 is a prime.

It is a D-number.

1989213 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331533 + ... + 331538.

It is an arithmetic number, because the mean of its divisors is an integer number (663072).

2^1989213 is an apocalyptic number.

It is an amenable number.

1989213 is a deficient number, since it is larger than the sum of its proper divisors (663075).

1989213 is an equidigital number, since it uses as much as digits as its factorization.

1989213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663074.

The product of its digits is 3888, while the sum is 33.

The square root of 1989213 is about 1410.3946256279. The cubic root of 1989213 is about 125.7651837265.

The spelling of 1989213 in words is "one million, nine hundred eighty-nine thousand, two hundred thirteen".