726918289 has 4 divisors (see below), whose sum is σ = 758523456. Its totient is φ = 695313124.

The previous prime is 726918281. The next prime is 726918323. The reversal of 726918289 is 982819627.

726918289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982819627 = 2141 ⋅459047.

It is a cyclic number.

It is not a de Polignac number, because 726918289 - 2³ = 726918281 is a prime.

It is a super-3 number, since 3×726918289³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726918281) 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, 15802549 + ... + 15802594.

It is an arithmetic number, because the mean of its divisors is an integer number (189630864).

Almost surely, 2^726918289 is an apocalyptic number.

It is an amenable number.

726918289 is a deficient number, since it is larger than the sum of its proper divisors (31605167).

726918289 is a wasteful number, since it uses less digits than its factorization.

726918289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31605166.

The product of its digits is 870912, while the sum is 52.

The square root of 726918289 is about 26961.4222362249. The cubic root of 726918289 is about 899.1425120821.

The spelling of 726918289 in words is "seven hundred twenty-six million, nine hundred eighteen thousand, two hundred eighty-nine".