1223240 has 32 divisors (see below), whose sum is σ = 2809080. Its totient is φ = 479232.

The previous prime is 1223237. The next prime is 1223263. The reversal of 1223240 is 423221.

It can be written as a sum of positive squares in 4 ways, for example, as 1223236 + 4 = 1106^2 + 2^2 .

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, 1832 + ... + 2408.

2^1223240 is an apocalyptic number.

1223240 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 1223240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1404540).

1223240 is an abundant number, since it is smaller than the sum of its proper divisors (1585840).

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

1223240 is a wasteful number, since it uses less digits than its factorization.

1223240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 1223240 is about 1106.0018083168. The cubic root of 1223240 is about 106.9474805582.

Adding to 1223240 its reverse (423221), we get a palindrome (1646461).

The spelling of 1223240 in words is "one million, two hundred twenty-three thousand, two hundred forty".