1243145320 has 64 divisors (see below), whose sum is σ = 2899411200. Its totient is φ = 479136000.

The previous prime is 1243145317. The next prime is 1243145341. The reversal of 1243145320 is 235413421.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 870447 + ... + 871873.

It is an arithmetic number, because the mean of its divisors is an integer number (45303300).

Almost surely, 2^1243145320 is an apocalyptic number.

1243145320 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 1243145320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1449705600).

1243145320 is an abundant number, since it is smaller than the sum of its proper divisors (1656265880).

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

1243145320 is a wasteful number, since it uses less digits than its factorization.

1243145320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218 (or 2214 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1243145320 is about 35258.2659811852. The cubic root of 1243145320 is about 1075.2446733501.

Adding to 1243145320 its reverse (235413421), we get a palindrome (1478558741).

The spelling of 1243145320 in words is "one billion, two hundred forty-three million, one hundred forty-five thousand, three hundred twenty".