1989393 has 16 divisors (see below), whose sum is σ = 3083136. Its totient is φ = 1117440.

The previous prime is 1989353. The next prime is 1989401. The reversal of 1989393 is 3939891.

It is a happy number.

It is not a de Polignac number, because 1989393 - 2⁶ = 1989329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1989353) 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 15 ways as a sum of consecutive naturals, for example, 505 + ... + 2057.

It is an arithmetic number, because the mean of its divisors is an integer number (192696).

2^1989393 is an apocalyptic number.

It is an amenable number.

1989393 is a deficient number, since it is larger than the sum of its proper divisors (1093743).

1989393 is a wasteful number, since it uses less digits than its factorization.

1989393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624.

The product of its digits is 52488, while the sum is 42.

The square root of 1989393 is about 1410.4584361122. The cubic root of 1989393 is about 125.7689770274.

It can be divided in two parts, 198 and 9393, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 1989393 in words is "one million, nine hundred eighty-nine thousand, three hundred ninety-three".