1211856 has 20 divisors (see below), whose sum is σ = 3130752. Its totient is φ = 403936.

The previous prime is 1211843. The next prime is 1211857. The reversal of 1211856 is 6581121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211857) 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 3 ways as a sum of consecutive naturals, for example, 12576 + ... + 12671.

2^1211856 is an apocalyptic number.

1211856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1211856 is an abundant number, since it is smaller than the sum of its proper divisors (1918896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211856 is a wasteful number, since it uses less digits than its factorization.

1211856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25258 (or 25252 counting only the distinct ones).

The product of its digits is 480, while the sum is 24.

The square root of 1211856 is about 1100.8433131014. The cubic root of 1211856 is about 106.6146795278.

Adding to 1211856 its reverse (6581121), we get a palindrome (7792977).

The spelling of 1211856 in words is "one million, two hundred eleven thousand, eight hundred fifty-six".