1211889 has 8 divisors (see below), whose sum is σ = 1846720. Its totient is φ = 692496.

The previous prime is 1211863. The next prime is 1211897. The reversal of 1211889 is 9881121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211889 - 2⁵ = 1211857 is a prime.

It is a super-3 number, since 3×1211889³ = 5339613043337365107, which contains 333 as substring.

It is a Duffinian number.

1211889 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28834 + ... + 28875.

It is an arithmetic number, because the mean of its divisors is an integer number (230840).

2^1211889 is an apocalyptic number.

It is an amenable number.

1211889 is a deficient number, since it is larger than the sum of its proper divisors (634831).

1211889 is an equidigital number, since it uses as much as digits as its factorization.

1211889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57719.

The product of its digits is 1152, while the sum is 30.

The square root of 1211889 is about 1100.8583015084. The cubic root of 1211889 is about 106.6156472589.

The spelling of 1211889 in words is "one million, two hundred eleven thousand, eight hundred eighty-nine".