1213856 has 24 divisors (see below), whose sum is σ = 2731680. Its totient is φ = 520128.

The previous prime is 1213841. The next prime is 1213873. The reversal of 1213856 is 6583121.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2486 + ... + 2933.

It is an arithmetic number, because the mean of its divisors is an integer number (113820).

2^1213856 is an apocalyptic number.

1213856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1213856 is an abundant number, since it is smaller than the sum of its proper divisors (1517824).

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

1213856 is an equidigital number, since it uses as much as digits as its factorization.

1213856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5436 (or 5428 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 1213856 is about 1101.7513331056. The cubic root of 1213856 is about 106.6732981988.

Adding to 1213856 its reverse (6583121), we get a palindrome (7796977).

The spelling of 1213856 in words is "one million, two hundred thirteen thousand, eight hundred fifty-six".