1221580 has 24 divisors (see below), whose sum is σ = 2594592. Its totient is φ = 483072.

The previous prime is 1221559. The next prime is 1221589. The reversal of 1221580 is 851221.

It is not an unprimeable number, because it can be changed into a prime (1221589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1764 + ... + 2356.

It is an arithmetic number, because the mean of its divisors is an integer number (108108).

2^1221580 is an apocalyptic number.

1221580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221580 is an abundant number, since it is smaller than the sum of its proper divisors (1373012).

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

1221580 is a wasteful number, since it uses less digits than its factorization.

1221580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1221580 is about 1105.2511026911. The cubic root of 1221580 is about 106.8990809023.

The spelling of 1221580 in words is "one million, two hundred twenty-one thousand, five hundred eighty".