1221396 has 48 divisors (see below), whose sum is σ = 3279360. Its totient is φ = 349920.

The previous prime is 1221391. The next prime is 1221421. The reversal of 1221396 is 6931221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2265 + ... + 2751.

It is an arithmetic number, because the mean of its divisors is an integer number (68320).

2^1221396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639680).

1221396 is an abundant number, since it is smaller than the sum of its proper divisors (2057964).

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

1221396 is a wasteful number, since it uses less digits than its factorization.

1221396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 522 counting only the distinct ones).

The product of its digits is 648, while the sum is 24.

The square root of 1221396 is about 1105.1678605533. The cubic root of 1221396 is about 106.8937134223.

The spelling of 1221396 in words is "one million, two hundred twenty-one thousand, three hundred ninety-six".