725440 has 28 divisors (see below), whose sum is σ = 1728216. Its totient is φ = 290048.

The previous prime is 725437. The next prime is 725447. The reversal of 725440 is 44527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 814 + ... + 1453.

It is an arithmetic number, because the mean of its divisors is an integer number (61722).

2⁷²⁵⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

725440 is an abundant number, since it is smaller than the sum of its proper divisors (1002776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

725440 is a wasteful number, since it uses less digits than its factorization.

725440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284 (or 2274 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 725440 is about 851.7276560028. The cubic root of 725440 is about 89.8532588171.

Adding to 725440 its reverse (44527), we get a palindrome (769967).

The spelling of 725440 in words is "seven hundred twenty-five thousand, four hundred forty".