813572 has 6 divisors (see below), whose sum is σ = 1423758. Its totient is φ = 406784.

The previous prime is 813559. The next prime is 813577. The reversal of 813572 is 275318.

It can be written as a sum of positive squares in only one way, i.e., 614656 + 198916 = 784^2 + 446^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813572.

It is not an unprimeable number, because it can be changed into a prime (813577) by changing a digit.

813572 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101693 + ... + 101700.

It is an arithmetic number, because the mean of its divisors is an integer number (237293).

2⁸¹³⁵⁷² is an apocalyptic number.

It is an amenable number.

813572 is a deficient number, since it is larger than the sum of its proper divisors (610186).

813572 is a wasteful number, since it uses less digits than its factorization.

813572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203397 (or 203395 counting only the distinct ones).

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

The square root of 813572 is about 901.9822614664. The cubic root of 813572 is about 93.3537993668.

The spelling of 813572 in words is "eight hundred thirteen thousand, five hundred seventy-two".