8189621 has 4 divisors (see below), whose sum is σ = 8934144. Its totient is φ = 7445100.

The previous prime is 8189603. The next prime is 8189639. The reversal of 8189621 is 1269818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8189603) and next prime (8189639).

It is a cyclic number.

It is not a de Polignac number, because 8189621 - 2¹⁰ = 8188597 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 (8189641) 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, 372245 + ... + 372266.

It is an arithmetic number, because the mean of its divisors is an integer number (2233536).

Almost surely, 2^8189621 is an apocalyptic number.

It is an amenable number.

8189621 is a deficient number, since it is larger than the sum of its proper divisors (744523).

8189621 is a wasteful number, since it uses less digits than its factorization.

8189621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744522.

The product of its digits is 6912, while the sum is 35.

The square root of 8189621 is about 2861.7513868259. The cubic root of 8189621 is about 201.5678520823.

The spelling of 8189621 in words is "eight million, one hundred eighty-nine thousand, six hundred twenty-one".