1243342220 has 48 divisors (see below), whose sum is σ = 2679572448. Its totient is φ = 484323840.

The previous prime is 1243342213. The next prime is 1243342229. The reversal of 1243342220 is 222433421.

It is not an unprimeable number, because it can be changed into a prime (1243342229) 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, 619739 + ... + 621741.

It is an arithmetic number, because the mean of its divisors is an integer number (55824426).

Almost surely, 2^1243342220 is an apocalyptic number.

1243342220 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 1243342220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1339786224).

1243342220 is an abundant number, since it is smaller than the sum of its proper divisors (1436230228).

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

1243342220 is a wasteful number, since it uses less digits than its factorization.

1243342220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810 (or 2808 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 1243342220 is about 35261.0581236582. The cubic root of 1243342220 is about 1075.3014391725.

Adding to 1243342220 its reverse (222433421), we get a palindrome (1465775641).

The spelling of 1243342220 in words is "one billion, two hundred forty-three million, three hundred forty-two thousand, two hundred twenty".