725506 has 4 divisors (see below), whose sum is σ = 1088262. Its totient is φ = 362752.

The previous prime is 725479. The next prime is 725507. The reversal of 725506 is 605527.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 707281 + 18225 = 841^2 + 135^2 .

It is not an unprimeable number, because it can be changed into a prime (725507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181375 + ... + 181378.

2⁷²⁵⁵⁰⁶ is an apocalyptic number.

725506 is a deficient number, since it is larger than the sum of its proper divisors (362756).

725506 is a wasteful number, since it uses less digits than its factorization.

725506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362755.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 725506 is about 851.7663999008. The cubic root of 725506 is about 89.8559836624.

The spelling of 725506 in words is "seven hundred twenty-five thousand, five hundred six".