1221560 has 16 divisors (see below), whose sum is σ = 2748600. Its totient is φ = 488608.

The previous prime is 1221559. The next prime is 1221589. The reversal of 1221560 is 651221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15230 + ... + 15309.

2^1221560 is an apocalyptic number.

1221560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221560 is an abundant number, since it is smaller than the sum of its proper divisors (1527040).

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

1221560 is a wasteful number, since it uses less digits than its factorization.

1221560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30550 (or 30546 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1221560 is about 1105.2420549364. The cubic root of 1221560 is about 106.8984975067.

Adding to 1221560 its reverse (651221), we get a palindrome (1872781).

The spelling of 1221560 in words is "one million, two hundred twenty-one thousand, five hundred sixty".