1989172 has 12 divisors (see below), whose sum is σ = 3491460. Its totient is φ = 991616.

The previous prime is 1989161. The next prime is 1989193. The reversal of 1989172 is 2719891.

It can be written as a sum of positive squares in 2 ways, for example, as 1752976 + 236196 = 1324^2 + 486^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1548 + ... + 2524.

It is an arithmetic number, because the mean of its divisors is an integer number (290955).

2^1989172 is an apocalyptic number.

It is an amenable number.

1989172 is a deficient number, since it is larger than the sum of its proper divisors (1502288).

1989172 is a wasteful number, since it uses less digits than its factorization.

1989172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490 (or 1488 counting only the distinct ones).

The product of its digits is 9072, while the sum is 37.

The square root of 1989172 is about 1410.3800906139. The cubic root of 1989172 is about 125.7643196649.

The spelling of 1989172 in words is "one million, nine hundred eighty-nine thousand, one hundred seventy-two".