1172889 has 15 divisors (see below), whose sum is σ = 1788293.
Its totient is φ = 740772.
The previous prime is 1172867. The next prime is 1172893. The reversal of 1172889 is 9882711.
Multipling 1172889 by its sum of digits (36), we get a square (42224004 = 64982).
It can be divided in two parts, 11 and 72889, that added together give a square (72900 = 2702).
The square root of 1172889 is 1083.
It is a perfect power (a square), and thus also a powerful number.
It is not a de Polignac number, because 1172889 - 29 = 1172377 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1172819) 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 14 ways as a sum of consecutive naturals, for example, 61722 + ... + 61740.
21172889 is an apocalyptic number.
1172889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.
1172889 is the 1083-rd square number.
1172889 is the 542-nd centered octagonal number.
It is an amenable number.
1172889 is a deficient number, since it is larger than the sum of its proper divisors (615404).
1172889 is an frugal number, since it uses more digits than its factorization.
1172889 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 82 (or 22 counting only the distinct ones).
The product of its digits is 8064, while the sum is 36.
The cubic root of 1172889 is about 105.4594829553.
The spelling of 1172889 in words is "one million, one hundred seventy-two thousand, eight hundred eighty-nine".