8640743 has 8 divisors (see below), whose sum is σ = 9253440. Its totient is φ = 8039680.

The previous prime is 8640739. The next prime is 8640761. The reversal of 8640743 is 3470468.

It is a happy number.

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 8640743 - 2² = 8640739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1343 + ... + 4368.

It is an arithmetic number, because the mean of its divisors is an integer number (1156680).

Almost surely, 2^8640743 is an apocalyptic number.

8640743 is a deficient number, since it is larger than the sum of its proper divisors (612697).

8640743 is a wasteful number, since it uses less digits than its factorization.

8640743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5817.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 8640743 is about 2939.5140754893. The cubic root of 8640743 is about 205.2029954332.

The spelling of 8640743 in words is "eight million, six hundred forty thousand, seven hundred forty-three".