8917621 has 8 divisors (see below), whose sum is σ = 9172440. Its totient is φ = 8666112.

The previous prime is 8917523. The next prime is 8917663. The reversal of 8917621 is 1267198.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7396 + 8910225 = 86^2 + 2985^2 .

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 8917621 - 2⁹ = 8917109 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 (8917681) 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, 5245 + ... + 6733.

It is an arithmetic number, because the mean of its divisors is an integer number (1146555).

Almost surely, 2^8917621 is an apocalyptic number.

It is an amenable number.

8917621 is a deficient number, since it is larger than the sum of its proper divisors (254819).

8917621 is a wasteful number, since it uses less digits than its factorization.

8917621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655.

The product of its digits is 6048, while the sum is 34.

The square root of 8917621 is about 2986.2386039967. The cubic root of 8917621 is about 207.3717870546.

The spelling of 8917621 in words is "eight million, nine hundred seventeen thousand, six hundred twenty-one".