1997289 has 24 divisors (see below), whose sum is σ = 3369600. Its totient is φ = 1139544.

The previous prime is 1997269. The next prime is 1997293. The reversal of 1997289 is 9827991.

It is not a de Polignac number, because 1997289 - 2⁵ = 1997257 is a prime.

1997289 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2764 + ... + 3410.

It is an arithmetic number, because the mean of its divisors is an integer number (140400).

2^1997289 is an apocalyptic number.

It is an amenable number.

1997289 is a deficient number, since it is larger than the sum of its proper divisors (1372311).

1997289 is an equidigital number, since it uses as much as digits as its factorization.

1997289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 657 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 1997289 is about 1413.2547541049. The cubic root of 1997289 is about 125.9351518156.

The spelling of 1997289 in words is "one million, nine hundred ninety-seven thousand, two hundred eighty-nine".