813844 has 6 divisors (see below), whose sum is σ = 1424234. Its totient is φ = 406920.

The previous prime is 813833. The next prime is 813847. The reversal of 813844 is 448318.

It can be written as a sum of positive squares in only one way, i.e., 810000 + 3844 = 900^2 + 62^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101727 + ... + 101734.

2⁸¹³⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

813844 is a deficient number, since it is larger than the sum of its proper divisors (610390).

813844 is a wasteful number, since it uses less digits than its factorization.

813844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203465 (or 203463 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 813844 is about 902.1330278845. The cubic root of 813844 is about 93.3642018078.

It can be divided in two parts, 81 and 3844, that multiplied together give a square (311364 = 558²).

The spelling of 813844 in words is "eight hundred thirteen thousand, eight hundred forty-four".