1221960 has 64 divisors (see below), whose sum is σ = 3888000. Its totient is φ = 306176.

The previous prime is 1221959. The next prime is 1221971. The reversal of 1221960 is 691221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1741 + ... + 2339.

It is an arithmetic number, because the mean of its divisors is an integer number (60750).

2^1221960 is an apocalyptic number.

1221960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944000).

1221960 is an abundant number, since it is smaller than the sum of its proper divisors (2666040).

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

1221960 is a wasteful number, since it uses less digits than its factorization.

1221960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1221960 is about 1105.4229959613. The cubic root of 1221960 is about 106.9101642095.

The spelling of 1221960 in words is "one million, two hundred twenty-one thousand, nine hundred sixty".