813622 has 4 divisors (see below), whose sum is σ = 1220436. Its totient is φ = 406810.

The previous prime is 813613. The next prime is 813623. The reversal of 813622 is 226318.

813622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 226318 = 2 ⋅113159.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 813593 and 813602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813623) by changing a digit.

813622 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203404 + ... + 203407.

It is an arithmetic number, because the mean of its divisors is an integer number (305109).

2⁸¹³⁶²² is an apocalyptic number.

813622 is a deficient number, since it is larger than the sum of its proper divisors (406814).

813622 is a wasteful number, since it uses less digits than its factorization.

813622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406813.

The product of its digits is 576, while the sum is 22.

The square root of 813622 is about 902.0099777719. The cubic root of 813622 is about 93.3557117541.

The spelling of 813622 in words is "eight hundred thirteen thousand, six hundred twenty-two".