8216427 has 4 divisors (see below), whose sum is σ = 10955240. Its totient is φ = 5477616.

The previous prime is 8216407. The next prime is 8216437. The reversal of 8216427 is 7246128.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8216427 - 2¹¹ = 8214379 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8216394 and 8216403.

It is not an unprimeable number, because it can be changed into a prime (8216407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369402 + ... + 1369407.

It is an arithmetic number, because the mean of its divisors is an integer number (2738810).

Almost surely, 2^8216427 is an apocalyptic number.

8216427 is a deficient number, since it is larger than the sum of its proper divisors (2738813).

8216427 is a wasteful number, since it uses less digits than its factorization.

8216427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738812.

The product of its digits is 5376, while the sum is 30.

The square root of 8216427 is about 2866.4310562091. The cubic root of 8216427 is about 201.7875343410.

Subtracting from 8216427 its reverse (7246128), we obtain a cube (970299 = 99³).

The spelling of 8216427 in words is "eight million, two hundred sixteen thousand, four hundred twenty-seven".