1219856 has 40 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 533120.

The previous prime is 1219849. The next prime is 1219859. The reversal of 1219856 is 6589121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4985 + ... + 5223.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2^1219856 is an apocalyptic number.

1219856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1219856 is the 638-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1219856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339200).

1219856 is an abundant number, since it is smaller than the sum of its proper divisors (1458544).

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

1219856 is a wasteful number, since it uses less digits than its factorization.

1219856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 281 counting only the distinct ones).

The product of its digits is 4320, while the sum is 32.

The square root of 1219856 is about 1104.4709140579. The cubic root of 1219856 is about 106.8487687981.

The spelling of 1219856 in words is "one million, two hundred nineteen thousand, eight hundred fifty-six".