8365821 has 8 divisors (see below), whose sum is σ = 11321184. Its totient is φ = 5493840.

The previous prime is 8365807. The next prime is 8365829. The reversal of 8365821 is 1285638.

It is a happy number.

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-8365821 is a prime.

It is a super-2 number, since 2×8365821² = 139973922008082, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8⁴ + 3³ + 6⁸ + 5⁸ + 8⁷ + 2²² + 1 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8365829) 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, 20610 + ... + 21011.

It is an arithmetic number, because the mean of its divisors is an integer number (1415148).

Almost surely, 2^8365821 is an apocalyptic number.

It is an amenable number.

8365821 is a deficient number, since it is larger than the sum of its proper divisors (2955363).

8365821 is a wasteful number, since it uses less digits than its factorization.

8365821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41691.

The product of its digits is 11520, while the sum is 33.

The square root of 8365821 is about 2892.3729012698. The cubic root of 8365821 is about 203.0031869560.

The spelling of 8365821 in words is "eight million, three hundred sixty-five thousand, eight hundred twenty-one".