813444 has 24 divisors (see below), whose sum is σ = 1935360. Its totient is φ = 265824.

The previous prime is 813443. The next prime is 813493. The reversal of 813444 is 444318.

It is a super-2 number, since 2×813444² = 1323382282272, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813444.

It is not an unprimeable number, because it can be changed into a prime (813443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4 + ... + 1275.

It is an arithmetic number, because the mean of its divisors is an integer number (80640).

2⁸¹³⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

813444 is an abundant number, since it is smaller than the sum of its proper divisors (1121916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813444 is a wasteful number, since it uses less digits than its factorization.

813444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339 (or 1337 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 813444 is about 901.9113038431. The cubic root of 813444 is about 93.3489032981.

The spelling of 813444 in words is "eight hundred thirteen thousand, four hundred forty-four".