725540 has 12 divisors (see below), whose sum is σ = 1523676. Its totient is φ = 290208.

The previous prime is 725537. The next prime is 725579. The reversal of 725540 is 45527.

It can be written as a sum of positive squares in 2 ways, for example, as 438244 + 287296 = 662^2 + 536^2 .

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 725540.

It is an unprimeable number.

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, 18119 + ... + 18158.

It is an arithmetic number, because the mean of its divisors is an integer number (126973).

2⁷²⁵⁵⁴⁰ is an apocalyptic number.

It is an amenable number.

725540 is an abundant number, since it is smaller than the sum of its proper divisors (798136).

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

725540 is a wasteful number, since it uses less digits than its factorization.

725540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36286 (or 36284 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 725540 is about 851.7863581908. The cubic root of 725540 is about 89.8573873061.

The spelling of 725540 in words is "seven hundred twenty-five thousand, five hundred forty".