8213855 has 16 divisors (see below), whose sum is σ = 10723104. Its totient is φ = 6003840.

The previous prime is 8213851. The next prime is 8213869. The reversal of 8213855 is 5583128.

8213855 = T₁₀₃₉ + T₁₀₄₀ + ... + T₁₀₅₃.

It is a happy number.

8213855 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 8213855 - 2² = 8213851 is a prime.

It is a super-2 number, since 2×8213855² = 134934827922050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8213851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6365 + ... + 7545.

It is an arithmetic number, because the mean of its divisors is an integer number (670194).

Almost surely, 2^8213855 is an apocalyptic number.

8213855 is a deficient number, since it is larger than the sum of its proper divisors (2509249).

8213855 is a wasteful number, since it uses less digits than its factorization.

8213855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306.

The product of its digits is 9600, while the sum is 32.

The square root of 8213855 is about 2865.9823795690. The cubic root of 8213855 is about 201.7664768626.

The spelling of 8213855 in words is "eight million, two hundred thirteen thousand, eight hundred fifty-five".