1243315420 has 48 divisors (see below), whose sum is σ = 2662204608. Its totient is φ = 487618560.

The previous prime is 1243315379. The next prime is 1243315429. The reversal of 1243315420 is 245133421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243315429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429217 + ... + 432103.

It is an arithmetic number, because the mean of its divisors is an integer number (55462596).

Almost surely, 2^1243315420 is an apocalyptic number.

1243315420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243315420 is an abundant number, since it is smaller than the sum of its proper divisors (1418889188).

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

1243315420 is a wasteful number, since it uses less digits than its factorization.

1243315420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310 (or 3308 counting only the distinct ones).

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

The square root of 1243315420 is about 35260.6780989816. The cubic root of 1243315420 is about 1075.2937131458.

Adding to 1243315420 its reverse (245133421), we get a palindrome (1488448841).

The spelling of 1243315420 in words is "one billion, two hundred forty-three million, three hundred fifteen thousand, four hundred twenty".