8920643 has 4 divisors (see below), whose sum is σ = 8936088. Its totient is φ = 8905200.

The previous prime is 8920609. The next prime is 8920649. The reversal of 8920643 is 3460298.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3460298 = 2 ⋅1730149.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8920643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8920649) 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, 6821 + ... + 8022.

It is an arithmetic number, because the mean of its divisors is an integer number (2234022).

Almost surely, 2^8920643 is an apocalyptic number.

8920643 is a deficient number, since it is larger than the sum of its proper divisors (15445).

8920643 is a wasteful number, since it uses less digits than its factorization.

8920643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15444.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 8920643 is about 2986.7445488357. The cubic root of 8920643 is about 207.3952090997.

The spelling of 8920643 in words is "eight million, nine hundred twenty thousand, six hundred forty-three".