1223620 has 24 divisors (see below), whose sum is σ = 2591064. Its totient is φ = 485376.

The previous prime is 1223603. The next prime is 1223633. The reversal of 1223620 is 263221.

It can be written as a sum of positive squares in 4 ways, for example, as 9216 + 1214404 = 96^2 + 1102^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1223594 and 1223603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3702 + ... + 4018.

It is an arithmetic number, because the mean of its divisors is an integer number (107961).

2^1223620 is an apocalyptic number.

1223620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223620 is an abundant number, since it is smaller than the sum of its proper divisors (1367444).

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

1223620 is a wasteful number, since it uses less digits than its factorization.

1223620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1223620 is about 1106.1735849314. The cubic root of 1223620 is about 106.9585538377.

Adding to 1223620 its reverse (263221), we get a palindrome (1486841).

It can be divided in two parts, 12 and 23620, that added together give a palindrome (23632).

The spelling of 1223620 in words is "one million, two hundred twenty-three thousand, six hundred twenty".