1239681343 has 4 divisors (see below), whose sum is σ = 1240112160. Its totient is φ = 1239250528.

The previous prime is 1239681329. The next prime is 1239681379. The reversal of 1239681343 is 3431869321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3431869321 = 5927 ⋅579023.

It is a cyclic number.

It is not a de Polignac number, because 1239681343 - 2⁹ = 1239680831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1239681296 and 1239681305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239681643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211063 + ... + 216856.

It is an arithmetic number, because the mean of its divisors is an integer number (310028040).

Almost surely, 2^1239681343 is an apocalyptic number.

1239681343 is a deficient number, since it is larger than the sum of its proper divisors (430817).

1239681343 is an equidigital number, since it uses as much as digits as its factorization.

1239681343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430816.

The product of its digits is 93312, while the sum is 40.

The square root of 1239681343 is about 35209.1088072391. The cubic root of 1239681343 is about 1074.2450348713.

It can be divided in two parts, 12396 and 81343, that added together give a palindrome (93739).

The spelling of 1239681343 in words is "one billion, two hundred thirty-nine million, six hundred eighty-one thousand, three hundred forty-three".