813725 has 18 divisors (see below), whose sum is σ = 1113210. Its totient is φ = 589600.

The previous prime is 813721. The next prime is 813749. The reversal of 813725 is 527318.

It can be written as a sum of positive squares in 3 ways, for example, as 121 + 813604 = 11^2 + 902^2 .

It is not a de Polignac number, because 813725 - 2² = 813721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 813694 and 813703.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813725.

It is not an unprimeable number, because it can be changed into a prime (813721) 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 17 ways as a sum of consecutive naturals, for example, 2891 + ... + 3159.

It is an arithmetic number, because the mean of its divisors is an integer number (61845).

2⁸¹³⁷²⁵ is an apocalyptic number.

It is an amenable number.

813725 is a deficient number, since it is larger than the sum of its proper divisors (299485).

813725 is a wasteful number, since it uses less digits than its factorization.

813725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 285 counting only the distinct ones).

The product of its digits is 1680, while the sum is 26.

The square root of 813725 is about 902.0670706771. The cubic root of 813725 is about 93.3596510251.

The spelling of 813725 in words is "eight hundred thirteen thousand, seven hundred twenty-five".