726127989 has 4 divisors (see below), whose sum is σ = 968170656. Its totient is φ = 484085324.

The previous prime is 726127981. The next prime is 726128003. The reversal of 726127989 is 989721627.

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: 989721627 = 3 ⋅329907209.

It is a cyclic number.

It is not a de Polignac number, because 726127989 - 2³ = 726127981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726127981) 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, 121021329 + ... + 121021334.

It is an arithmetic number, because the mean of its divisors is an integer number (242042664).

Almost surely, 2^726127989 is an apocalyptic number.

It is an amenable number.

726127989 is a deficient number, since it is larger than the sum of its proper divisors (242042667).

726127989 is a wasteful number, since it uses less digits than its factorization.

726127989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242042666.

The product of its digits is 762048, while the sum is 51.

The square root of 726127989 is about 26946.7621246041. The cubic root of 726127989 is about 898.8165469723.

It can be divided in two parts, 72612 and 7989, that added together give a triangular number (80601 = T₄₀₁).

The spelling of 726127989 in words is "seven hundred twenty-six million, one hundred twenty-seven thousand, nine hundred eighty-nine".