725689 has 4 divisors (see below), whose sum is σ = 731124. Its totient is φ = 720256.

The previous prime is 725687. The next prime is 725723. The reversal of 725689 is 986527.

725689 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 an emirpimes, since its reverse is a distinct semiprime: 986527 = 17 ⋅58031.

It can be written as a sum of positive squares in 2 ways, for example, as 514089 + 211600 = 717^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 725689 - 2¹ = 725687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725687) 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, 2512 + ... + 2785.

It is an arithmetic number, because the mean of its divisors is an integer number (182781).

2⁷²⁵⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

725689 is a deficient number, since it is larger than the sum of its proper divisors (5435).

725689 is a wasteful number, since it uses less digits than its factorization.

725689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5434.

The product of its digits is 30240, while the sum is 37.

The square root of 725689 is about 851.8738169471. The cubic root of 725689 is about 89.8635380509.

The spelling of 725689 in words is "seven hundred twenty-five thousand, six hundred eighty-nine".