813855244 has 6 divisors (see below), whose sum is σ = 1424246684. Its totient is φ = 406927620.

The previous prime is 813855239. The next prime is 813855247. The reversal of 813855244 is 442558318.

It is a junction number, because it is equal to n+sod(n) for n = 813855197 and 813855206.

It is not an unprimeable number, because it can be changed into a prime (813855247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101731902 + ... + 101731909.

Almost surely, 2^813855244 is an apocalyptic number.

It is an amenable number.

813855244 is a deficient number, since it is larger than the sum of its proper divisors (610391440).

813855244 is a wasteful number, since it uses less digits than its factorization.

813855244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203463815 (or 203463813 counting only the distinct ones).

The product of its digits is 153600, while the sum is 40.

The square root of 813855244 is about 28528.1482749932. The cubic root of 813855244 is about 933.6463177644.

The spelling of 813855244 in words is "eight hundred thirteen million, eight hundred fifty-five thousand, two hundred forty-four".