726139 has 2 divisors, whose sum is σ = 726140. Its totient is φ = 726138.

The previous prime is 726137. The next prime is 726149. The reversal of 726139 is 931627.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 726139 - 2¹ = 726137 is a prime.

Together with 726137, it forms a pair of twin primes.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (726137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363069 + 363070.

It is an arithmetic number, because the mean of its divisors is an integer number (363070).

2⁷²⁶¹³⁹ is an apocalyptic number.

726139 is a deficient number, since it is larger than the sum of its proper divisors (1).

726139 is an equidigital number, since it uses as much as digits as its factorization.

726139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 28.

The square root of 726139 is about 852.1378996383. The cubic root of 726139 is about 89.8821090165.

The spelling of 726139 in words is "seven hundred twenty-six thousand, one hundred thirty-nine".