1989331 has 4 divisors (see below), whose sum is σ = 1992600. Its totient is φ = 1986064.

The previous prime is 1989329. The next prime is 1989341. The reversal of 1989331 is 1339891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1339891 = 7 ⋅191413.

It is a cyclic number.

It is not a de Polignac number, because 1989331 - 2¹ = 1989329 is a prime.

It is a super-2 number, since 2×1989331² = 7914875655122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989341) 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, 421 + ... + 2038.

It is an arithmetic number, because the mean of its divisors is an integer number (498150).

2^1989331 is an apocalyptic number.

1989331 is a deficient number, since it is larger than the sum of its proper divisors (3269).

1989331 is an equidigital number, since it uses as much as digits as its factorization.

1989331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3268.

The product of its digits is 5832, while the sum is 34.

The square root of 1989331 is about 1410.4364572713. The cubic root of 1989331 is about 125.7676704718.

The spelling of 1989331 in words is "one million, nine hundred eighty-nine thousand, three hundred thirty-one".