1223660 has 48 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 445440.

The previous prime is 1223633. The next prime is 1223683. The reversal of 1223660 is 663221.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20030 + ... + 20090.

It is an arithmetic number, because the mean of its divisors is an integer number (58590).

2^1223660 is an apocalyptic number.

1223660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406160).

1223660 is an abundant number, since it is smaller than the sum of its proper divisors (1588660).

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

1223660 is a wasteful number, since it uses less digits than its factorization.

1223660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1223660 is about 1106.1916651286. The cubic root of 1223660 is about 106.9597193127.

Adding to 1223660 its reverse (663221), we get a palindrome (1886881).

The spelling of 1223660 in words is "one million, two hundred twenty-three thousand, six hundred sixty".