1220660 has 24 divisors (see below), whose sum is σ = 2929920. Its totient is φ = 418464.

The previous prime is 1220657. The next prime is 1220663. The reversal of 1220660 is 660221.

It is an interprime number because it is at equal distance from previous prime (1220657) and next prime (1220663).

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4220 + ... + 4499.

It is an arithmetic number, because the mean of its divisors is an integer number (122080).

2^1220660 is an apocalyptic number.

1220660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220660 is an abundant number, since it is smaller than the sum of its proper divisors (1709260).

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

1220660 is a wasteful number, since it uses less digits than its factorization.

1220660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8735 (or 8733 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1220660 is about 1104.8348292845. The cubic root of 1220660 is about 106.8722381102.

Adding to 1220660 its reverse (660221), we get a palindrome (1880881).

The spelling of 1220660 in words is "one million, two hundred twenty thousand, six hundred sixty".