725436 has 30 divisors (see below), whose sum is σ = 1897280. Its totient is φ = 241704.

The previous prime is 725423. The next prime is 725437. The reversal of 725436 is 634527.

It is a happy number.

725436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725437) by changing a digit.

725436 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 796 + ... + 1443.

2⁷²⁵⁴³⁶ is an apocalyptic number.

It is an amenable number.

725436 is an abundant number, since it is smaller than the sum of its proper divisors (1171844).

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

725436 is a wasteful number, since it uses less digits than its factorization.

725436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255 (or 2244 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 725436 is about 851.7253078311. The cubic root of 725436 is about 89.8530936697.

Subtracting from 725436 its reverse (634527), we obtain a palindrome (90909).

The spelling of 725436 in words is "seven hundred twenty-five thousand, four hundred thirty-six".