725909 has 2 divisors, whose sum is σ = 725910. Its totient is φ = 725908.

The previous prime is 725897. The next prime is 725929. The reversal of 725909 is 909527.

725909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 485809 + 240100 = 697^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 725909 - 2⁸ = 725653 is a prime.

It is a Chen prime.

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 725909.

It is not a weakly prime, because it can be changed into another prime (725929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362954 + 362955.

It is an arithmetic number, because the mean of its divisors is an integer number (362955).

2⁷²⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

725909 is a deficient number, since it is larger than the sum of its proper divisors (1).

725909 is an equidigital number, since it uses as much as digits as its factorization.

725909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 725909 is about 852.0029342672. The cubic root of 725909 is about 89.8726181486.

The spelling of 725909 in words is "seven hundred twenty-five thousand, nine hundred nine".