1243809342 has 36 divisors (see below), whose sum is σ = 2783717664. Its totient is φ = 400960080.

The previous prime is 1243809317. The next prime is 1243809349. The reversal of 1243809342 is 2439083421.

It is a junction number, because it is equal to n+sod(n) for n = 1243809297 and 1243809306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243809349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 832348 + ... + 833840.

Almost surely, 2^1243809342 is an apocalyptic number.

1243809342 is an abundant number, since it is smaller than the sum of its proper divisors (1539908322).

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

1243809342 is an equidigital number, since it uses as much as digits as its factorization.

1243809342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3025 (or 1529 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 1243809342 is about 35267.6812676989. The cubic root of 1243809342 is about 1075.4360854133.

The spelling of 1243809342 in words is "one billion, two hundred forty-three million, eight hundred nine thousand, three hundred forty-two".