1220648 has 48 divisors (see below), whose sum is σ = 2737140. Its totient is φ = 506880.

The previous prime is 1220623. The next prime is 1220657. The reversal of 1220648 is 8460221.

It can be written as a sum of positive squares in 2 ways, for example, as 1162084 + 58564 = 1078^2 + 242^2 .

It is a nialpdrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12536 + ... + 12632.

2^1220648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1368570).

1220648 is an abundant number, since it is smaller than the sum of its proper divisors (1516492).

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

1220648 is a wasteful number, since it uses less digits than its factorization.

1220648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1220648 is about 1104.8293985951. The cubic root of 1220648 is about 106.8718878977.

Adding to 1220648 its reverse (8460221), we get a palindrome (9680869).

The spelling of 1220648 in words is "one million, two hundred twenty thousand, six hundred forty-eight".