8243621 has 4 divisors (see below), whose sum is σ = 8293152. Its totient is φ = 8194092.

The previous prime is 8243617. The next prime is 8243633. The reversal of 8243621 is 1263428.

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 a cyclic number.

It is not a de Polignac number, because 8243621 - 2² = 8243617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8243611) 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, 24515 + ... + 24848.

It is an arithmetic number, because the mean of its divisors is an integer number (2073288).

Almost surely, 2^8243621 is an apocalyptic number.

It is an amenable number.

8243621 is a deficient number, since it is larger than the sum of its proper divisors (49531).

8243621 is a wasteful number, since it uses less digits than its factorization.

8243621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49530.

The product of its digits is 2304, while the sum is 26.

The square root of 8243621 is about 2871.1706671670. The cubic root of 8243621 is about 202.0099086732.

The spelling of 8243621 in words is "eight million, two hundred forty-three thousand, six hundred twenty-one".