1220564 has 12 divisors (see below), whose sum is σ = 2229024. Its totient is φ = 583704.

The previous prime is 1220507. The next prime is 1220591. The reversal of 1220564 is 4650221.

It is a happy number.

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, 6542 + ... + 6725.

It is an arithmetic number, because the mean of its divisors is an integer number (185752).

2^1220564 is an apocalyptic number.

It is an amenable number.

1220564 is a deficient number, since it is larger than the sum of its proper divisors (1008460).

1220564 is a wasteful number, since it uses less digits than its factorization.

1220564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13294 (or 13292 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1220564 is about 1104.7913830222. The cubic root of 1220564 is about 106.8694363461.

Adding to 1220564 its reverse (4650221), we get a palindrome (5870785).

The spelling of 1220564 in words is "one million, two hundred twenty thousand, five hundred sixty-four".