726995989 has 4 divisors (see below), whose sum is σ = 727062156. Its totient is φ = 726929824.

The previous prime is 726995963. The next prime is 726996013. The reversal of 726995989 is 989599627.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 989599627 = 23549 ⋅42023.

It can be written as a sum of positive squares in 2 ways, for example, as 348382225 + 378613764 = 18665^2 + 19458^2 .

It is a cyclic number.

It is not a de Polignac number, because 726995989 - 2⁷ = 726995861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 726995989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726995959) 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 3 ways as a sum of consecutive naturals, for example, 12214 + ... + 40039.

It is an arithmetic number, because the mean of its divisors is an integer number (181765539).

Almost surely, 2^726995989 is an apocalyptic number.

It is an amenable number.

726995989 is a deficient number, since it is larger than the sum of its proper divisors (66167).

726995989 is a wasteful number, since it uses less digits than its factorization.

726995989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66166.

The product of its digits is 22044960, while the sum is 64.

The square root of 726995989 is about 26962.8631454451. The cubic root of 726995989 is about 899.1745472664.

The spelling of 726995989 in words is "seven hundred twenty-six million, nine hundred ninety-five thousand, nine hundred eighty-nine".