1989197 has 16 divisors (see below), whose sum is σ = 2419200. Its totient is φ = 1599360.

The previous prime is 1989193. The next prime is 1989203. The reversal of 1989197 is 7919891.

It is not a de Polignac number, because 1989197 - 2² = 1989193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8204 + ... + 8442.

It is an arithmetic number, because the mean of its divisors is an integer number (151200).

2^1989197 is an apocalyptic number.

It is an amenable number.

1989197 is a deficient number, since it is larger than the sum of its proper divisors (430003).

1989197 is a wasteful number, since it uses less digits than its factorization.

1989197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316.

The product of its digits is 40824, while the sum is 44.

The square root of 1989197 is about 1410.3889534451. The cubic root of 1989197 is about 125.7648465331.

The spelling of 1989197 in words is "one million, nine hundred eighty-nine thousand, one hundred ninety-seven".