725391 has 6 divisors (see below), whose sum is σ = 1047800. Its totient is φ = 483588.

The previous prime is 725381. The next prime is 725393. The reversal of 725391 is 193527.

725391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 725391 - 2⁵ = 725359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 725391.

It is not an unprimeable number, because it can be changed into a prime (725393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40291 + ... + 40308.

2⁷²⁵³⁹¹ is an apocalyptic number.

725391 is a deficient number, since it is larger than the sum of its proper divisors (322409).

725391 is a wasteful number, since it uses less digits than its factorization.

725391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80605 (or 80602 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 725391 is about 851.6988904537. The cubic root of 725391 is about 89.8512357191.

The spelling of 725391 in words is "seven hundred twenty-five thousand, three hundred ninety-one".