8221837 has 8 divisors (see below), whose sum is σ = 9022104. Its totient is φ = 7445568.

The previous prime is 8221831. The next prime is 8221841. The reversal of 8221837 is 7381228.

It can be written as a sum of positive squares in 4 ways, for example, as 1901641 + 6320196 = 1379^2 + 2514^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-8221837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8221799 and 8221808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221831) 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, 5278 + ... + 6655.

It is an arithmetic number, because the mean of its divisors is an integer number (1127763).

Almost surely, 2^8221837 is an apocalyptic number.

It is an amenable number.

8221837 is a deficient number, since it is larger than the sum of its proper divisors (800267).

8221837 is a wasteful number, since it uses less digits than its factorization.

8221837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11999.

The product of its digits is 5376, while the sum is 31.

The square root of 8221837 is about 2867.3745831335. The cubic root of 8221837 is about 201.8318127542.

The spelling of 8221837 in words is "eight million, two hundred twenty-one thousand, eight hundred thirty-seven".