8640349 has 2 divisors, whose sum is σ = 8640350. Its totient is φ = 8640348.

The previous prime is 8640337. The next prime is 8640391. The reversal of 8640349 is 9430468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4334724 + 4305625 = 2082^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 8640349 - 2⁷ = 8640221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8640329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320174 + 4320175.

It is an arithmetic number, because the mean of its divisors is an integer number (4320175).

Almost surely, 2^8640349 is an apocalyptic number.

It is an amenable number.

8640349 is a deficient number, since it is larger than the sum of its proper divisors (1).

8640349 is an equidigital number, since it uses as much as digits as its factorization.

8640349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 8640349 is about 2939.4470568459. The cubic root of 8640349 is about 205.1998764418.

The spelling of 8640349 in words is "eight million, six hundred forty thousand, three hundred forty-nine".