1221360 has 80 divisors (see below), whose sum is σ = 4333056. Its totient is φ = 278784.

The previous prime is 1221299. The next prime is 1221373. The reversal of 1221360 is 631221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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, 1317 + ... + 2043.

2^1221360 is an apocalyptic number.

1221360 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 1221360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2166528).

1221360 is an abundant number, since it is smaller than the sum of its proper divisors (3111696).

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

1221360 is a wasteful number, since it uses less digits than its factorization.

1221360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1221360 is about 1105.1515733147. The cubic root of 1221360 is about 106.8926632001.

Adding to 1221360 its reverse (631221), we get a palindrome (1852581).

The spelling of 1221360 in words is "one million, two hundred twenty-one thousand, three hundred sixty".