725518 has 4 divisors (see below), whose sum is σ = 1088280. Its totient is φ = 362758.

The previous prime is 725507. The next prime is 725519. The reversal of 725518 is 815527.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181378 + ... + 181381.

It is an arithmetic number, because the mean of its divisors is an integer number (272070).

2⁷²⁵⁵¹⁸ is an apocalyptic number.

725518 is a deficient number, since it is larger than the sum of its proper divisors (362762).

725518 is a wasteful number, since it uses less digits than its factorization.

725518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362761.

The product of its digits is 2800, while the sum is 28.

The square root of 725518 is about 851.7734440566. The cubic root of 725518 is about 89.8564790711.

Subtracting 725518 from its reverse (815527), we obtain a palindrome (90009).

The spelling of 725518 in words is "seven hundred twenty-five thousand, five hundred eighteen".