725139 has 16 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 477000.

The previous prime is 725119. The next prime is 725147. The reversal of 725139 is 931527.

It is not a de Polignac number, because 725139 - 2⁹ = 724627 is a prime.

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

It is an Ulam number.

725139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (725119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2764 + ... + 3014.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2⁷²⁵¹³⁹ is an apocalyptic number.

725139 is a deficient number, since it is larger than the sum of its proper divisors (363501).

725139 is a wasteful number, since it uses less digits than its factorization.

725139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 361 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 725139 is about 851.5509379949. The cubic root of 725139 is about 89.8408297753.

The spelling of 725139 in words is "seven hundred twenty-five thousand, one hundred thirty-nine".