8457749 has 2 divisors, whose sum is σ = 8457750. Its totient is φ = 8457748.

The previous prime is 8457739. The next prime is 8457751. The reversal of 8457749 is 9477548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5712100 + 2745649 = 2390^2 + 1657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8457749 is a prime.

It is a Sophie Germain prime.

Together with 8457751, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8457739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4228874 + 4228875.

It is an arithmetic number, because the mean of its divisors is an integer number (4228875).

Almost surely, 2^8457749 is an apocalyptic number.

It is an amenable number.

8457749 is a deficient number, since it is larger than the sum of its proper divisors (1).

8457749 is an equidigital number, since it uses as much as digits as its factorization.

8457749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 44.

The square root of 8457749 is about 2908.2209338357. The cubic root of 8457749 is about 203.7440481531.

The spelling of 8457749 in words is "eight million, four hundred fifty-seven thousand, seven hundred forty-nine".