725345 has 4 divisors (see below), whose sum is σ = 870420. Its totient is φ = 580272.

The previous prime is 725341. The next prime is 725357. The reversal of 725345 is 543527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543527 = 367 ⋅1481.

It can be written as a sum of positive squares in 2 ways, for example, as 327184 + 398161 = 572^2 + 631^2 .

It is a cyclic number.

It is not a de Polignac number, because 725345 - 2² = 725341 is a prime.

It is a super-2 number, since 2×725345² = 1052250738050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (725341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72530 + ... + 72539.

It is an arithmetic number, because the mean of its divisors is an integer number (217605).

2⁷²⁵³⁴⁵ is an apocalyptic number.

It is an amenable number.

725345 is a deficient number, since it is larger than the sum of its proper divisors (145075).

725345 is a wasteful number, since it uses less digits than its factorization.

725345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145074.

The product of its digits is 4200, while the sum is 26.

The square root of 725345 is about 851.6718851764. The cubic root of 725345 is about 89.8493364012.

It can be divided in two parts, 7 and 25345, that added together give a palindrome (25352).

The spelling of 725345 in words is "seven hundred twenty-five thousand, three hundred forty-five".