8643457 has 2 divisors, whose sum is σ = 8643458. Its totient is φ = 8643456.

The previous prime is 8643443. The next prime is 8643487. The reversal of 8643457 is 7543468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7789681 + 853776 = 2791^2 + 924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8643457 is a prime.

It is not a weakly prime, because it can be changed into another prime (8643487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321728 + 4321729.

It is an arithmetic number, because the mean of its divisors is an integer number (4321729).

Almost surely, 2^8643457 is an apocalyptic number.

It is an amenable number.

8643457 is a deficient number, since it is larger than the sum of its proper divisors (1).

8643457 is an equidigital number, since it uses as much as digits as its factorization.

8643457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 37.

The square root of 8643457 is about 2939.9756801715. The cubic root of 8643457 is about 205.2244774837.

The spelling of 8643457 in words is "eight million, six hundred forty-three thousand, four hundred fifty-seven".