725239 has 4 divisors (see below), whose sum is σ = 727056. Its totient is φ = 723424.

The previous prime is 725209. The next prime is 725273. The reversal of 725239 is 932527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932527 = 47 ⋅19841.

It is a cyclic number.

It is not a de Polignac number, because 725239 - 2⁷ = 725111 is a prime.

It is a Duffinian number.

725239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19 + ... + 1204.

It is an arithmetic number, because the mean of its divisors is an integer number (181764).

2⁷²⁵²³⁹ is an apocalyptic number.

725239 is a deficient number, since it is larger than the sum of its proper divisors (1817).

725239 is a wasteful number, since it uses less digits than its factorization.

725239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816.

The product of its digits is 3780, while the sum is 28.

The square root of 725239 is about 851.6096523643. The cubic root of 725239 is about 89.8449594065.

The spelling of 725239 in words is "seven hundred twenty-five thousand, two hundred thirty-nine".