1221968 has 40 divisors (see below), whose sum is σ = 2651616. Its totient is φ = 540800.

The previous prime is 1221959. The next prime is 1221971. The reversal of 1221968 is 8691221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221968.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9263 + ... + 9393.

2^1221968 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 1221968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1325808).

1221968 is an abundant number, since it is smaller than the sum of its proper divisors (1429648).

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

1221968 is a wasteful number, since it uses less digits than its factorization.

1221968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 197 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 1221968 is about 1105.4266144797. The cubic root of 1221968 is about 106.9103975176.

The spelling of 1221968 in words is "one million, two hundred twenty-one thousand, nine hundred sixty-eight".