1189921 has 4 divisors (see below), whose sum is σ = 1192212. Its totient is φ = 1187632.

The previous prime is 1189919. The next prime is 1189933. The reversal of 1189921 is 1299811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 829921 + 360000 = 911^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189921 - 2¹ = 1189919 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1189901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51 + ... + 1543.

It is an arithmetic number, because the mean of its divisors is an integer number (298053).

2^1189921 is an apocalyptic number.

It is an amenable number.

1189921 is a deficient number, since it is larger than the sum of its proper divisors (2291).

1189921 is an equidigital number, since it uses as much as digits as its factorization.

1189921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290.

The product of its digits is 1296, while the sum is 31.

The square root of 1189921 is about 1090.8350012720. The cubic root of 1189921 is about 105.9675051695.

The spelling of 1189921 in words is "one million, one hundred eighty-nine thousand, nine hundred twenty-one".