725989 has 8 divisors (see below), whose sum is σ = 817920. Its totient is φ = 638400.

The previous prime is 725983. The next prime is 725993. The reversal of 725989 is 989527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 725989 - 2³ = 725981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724 + ... + 1405.

It is an arithmetic number, because the mean of its divisors is an integer number (102240).

2⁷²⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

725989 is a deficient number, since it is larger than the sum of its proper divisors (91931).

725989 is a wasteful number, since it uses less digits than its factorization.

725989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171.

The product of its digits is 45360, while the sum is 40.

The square root of 725989 is about 852.0498811689. The cubic root of 725989 is about 89.8759195474.

The spelling of 725989 in words is "seven hundred twenty-five thousand, nine hundred eighty-nine".