726839 has 2 divisors, whose sum is σ = 726840. Its totient is φ = 726838.

The previous prime is 726811. The next prime is 726841. The reversal of 726839 is 938627.

726839 is nontrivially palindromic in base 15.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726839 is a prime.

Together with 726841, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 726799 and 726808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363419 + 363420.

It is an arithmetic number, because the mean of its divisors is an integer number (363420).

2⁷²⁶⁸³⁹ is an apocalyptic number.

726839 is a deficient number, since it is larger than the sum of its proper divisors (1).

726839 is an equidigital number, since it uses as much as digits as its factorization.

726839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 726839 is about 852.5485323429. The cubic root of 726839 is about 89.9109819410.

The spelling of 726839 in words is "seven hundred twenty-six thousand, eight hundred thirty-nine".