7718449 has 2 divisors, whose sum is σ = 7718450. Its totient is φ = 7718448.

The previous prime is 7718423. The next prime is 7718461. The reversal of 7718449 is 9448177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5094049 + 2624400 = 2257^2 + 1620^2 .

It is an emirp because it is prime and its reverse (9448177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7718449 - 2⁹ = 7717937 is a prime.

It is not a weakly prime, because it can be changed into another prime (7718749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3859224 + 3859225.

It is an arithmetic number, because the mean of its divisors is an integer number (3859225).

Almost surely, 2^7718449 is an apocalyptic number.

It is an amenable number.

7718449 is a deficient number, since it is larger than the sum of its proper divisors (1).

7718449 is an equidigital number, since it uses as much as digits as its factorization.

7718449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 7718449 is about 2778.2096753125. The cubic root of 7718449 is about 197.6256658980.

The spelling of 7718449 in words is "seven million, seven hundred eighteen thousand, four hundred forty-nine".