1223321240 has 64 divisors (see below), whose sum is σ = 2877197760. Its totient is φ = 467230720.

The previous prime is 1223321237. The next prime is 1223321243. The reversal of 1223321240 is 421233221.

It is an interprime number because it is at equal distance from previous prime (1223321237) and next prime (1223321243).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223321243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 898160 + ... + 899520.

It is an arithmetic number, because the mean of its divisors is an integer number (44956215).

Almost surely, 2^1223321240 is an apocalyptic number.

1223321240 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 1223321240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1438598880).

1223321240 is an abundant number, since it is smaller than the sum of its proper divisors (1653876520).

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

1223321240 is a wasteful number, since it uses less digits than its factorization.

1223321240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372 (or 2368 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1223321240 is about 34976.0094922220. The cubic root of 1223321240 is about 1069.4984810152.

Adding to 1223321240 its reverse (421233221), we get a palindrome (1644554461).

The spelling of 1223321240 in words is "one billion, two hundred twenty-three million, three hundred twenty-one thousand, two hundred forty".