1243213420 has 48 divisors (see below), whose sum is σ = 2676199680. Its totient is φ = 484860096.

The previous prime is 1243213409. The next prime is 1243213423. The reversal of 1243213420 is 243123421.

It is a junction number, because it is equal to n+sod(n) for n = 1243213391 and 1243213400.

It is not an unprimeable number, because it can be changed into a prime (1243213423) 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, 720679 + ... + 722401.

It is an arithmetic number, because the mean of its divisors is an integer number (55754160).

Almost surely, 2^1243213420 is an apocalyptic number.

1243213420 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 1243213420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1338099840).

1243213420 is an abundant number, since it is smaller than the sum of its proper divisors (1432986260).

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

1243213420 is a wasteful number, since it uses less digits than its factorization.

1243213420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614 (or 2612 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1243213420 is about 35259.2316989466. The cubic root of 1243213420 is about 1075.2643071033.

Adding to 1243213420 its reverse (243123421), we get a palindrome (1486336841).

It can be divided in two parts, 12432 and 13420, that added together give a palindrome (25852).

The spelling of 1243213420 in words is "one billion, two hundred forty-three million, two hundred thirteen thousand, four hundred twenty".