8240643 has 8 divisors (see below), whose sum is σ = 12208400. Its totient is φ = 5493744.

The previous prime is 8240633. The next prime is 8240663. The reversal of 8240643 is 3460428.

It is not a de Polignac number, because 8240643 - 2⁴ = 8240627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 305209 = 8240643 / (8 + 2 + 4 + 0 + 6 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8240633) 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, 152578 + ... + 152631.

It is an arithmetic number, because the mean of its divisors is an integer number (1526050).

Almost surely, 2^8240643 is an apocalyptic number.

8240643 is a deficient number, since it is larger than the sum of its proper divisors (3967757).

8240643 is a wasteful number, since it uses less digits than its factorization.

8240643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305218 (or 305212 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 8240643 is about 2870.6520165286. The cubic root of 8240643 is about 201.9855804496.

The spelling of 8240643 in words is "eight million, two hundred forty thousand, six hundred forty-three".