726810989 has 2 divisors, whose sum is σ = 726810990. Its totient is φ = 726810988.

The previous prime is 726810949. The next prime is 726810991. The reversal of 726810989 is 989018627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414122500 + 312688489 = 20350^2 + 17683^2 .

It is a cyclic number.

It is not a de Polignac number, because 726810989 - 2²⁰ = 725762413 is a prime.

Together with 726810991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726810949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363405494 + 363405495.

It is an arithmetic number, because the mean of its divisors is an integer number (363405495).

Almost surely, 2^726810989 is an apocalyptic number.

It is an amenable number.

726810989 is a deficient number, since it is larger than the sum of its proper divisors (1).

726810989 is an equidigital number, since it uses as much as digits as its factorization.

726810989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 726810989 is about 26959.4322825982. The cubic root of 726810989 is about 899.0982692649.

The spelling of 726810989 in words is "seven hundred twenty-six million, eight hundred ten thousand, nine hundred eighty-nine".