1989897 has 32 divisors (see below), whose sum is σ = 3370752. Its totient is φ = 1016064.

The previous prime is 1989877. The next prime is 1989899. The reversal of 1989897 is 7989891.

It is not a de Polignac number, because 1989897 - 2⁷ = 1989769 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1989899) 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 31 ways as a sum of consecutive naturals, for example, 10003 + ... + 10199.

It is an arithmetic number, because the mean of its divisors is an integer number (105336).

2^1989897 is an apocalyptic number.

It is an amenable number.

1989897 is a deficient number, since it is larger than the sum of its proper divisors (1380855).

1989897 is a wasteful number, since it uses less digits than its factorization.

1989897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257.

The product of its digits is 326592, while the sum is 51.

The square root of 1989897 is about 1410.6370901121. The cubic root of 1989897 is about 125.7795970527.

The spelling of 1989897 in words is "one million, nine hundred eighty-nine thousand, eight hundred ninety-seven".