8005621 has 8 divisors (see below), whose sum is σ = 8681400. Its totient is φ = 7338432.

The previous prime is 8005603. The next prime is 8005643. The reversal of 8005621 is 1265008.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 87025 + 7918596 = 295^2 + 2814^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8005621 - 2⁷ = 8005493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8005592 and 8005601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8005681) 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, 130 + ... + 4003.

It is an arithmetic number, because the mean of its divisors is an integer number (1085175).

Almost surely, 2^8005621 is an apocalyptic number.

It is an amenable number.

8005621 is a deficient number, since it is larger than the sum of its proper divisors (675779).

8005621 is a wasteful number, since it uses less digits than its factorization.

8005621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 8005621 is about 2829.4206120688. The cubic root of 8005621 is about 200.0468307002.

The spelling of 8005621 in words is "eight million, five thousand, six hundred twenty-one".