8221693 has 4 divisors (see below), whose sum is σ = 8705340. Its totient is φ = 7738048.

The previous prime is 8221669. The next prime is 8221721. The reversal of 8221693 is 3961228.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4149369 + 4072324 = 2037^2 + 2018^2 .

It is a cyclic number.

It is not a de Polignac number, because 8221693 - 2²¹ = 6124541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241798 + ... + 241831.

It is an arithmetic number, because the mean of its divisors is an integer number (2176335).

Almost surely, 2^8221693 is an apocalyptic number.

It is an amenable number.

8221693 is a deficient number, since it is larger than the sum of its proper divisors (483647).

8221693 is a wasteful number, since it uses less digits than its factorization.

8221693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483646.

The product of its digits is 5184, while the sum is 31.

The square root of 8221693 is about 2867.3494729454. The cubic root of 8221693 is about 201.8306344307.

The spelling of 8221693 in words is "eight million, two hundred twenty-one thousand, six hundred ninety-three".