77394917 has 2 divisors, whose sum is σ = 77394918. Its totient is φ = 77394916.

The previous prime is 77394907. The next prime is 77394949. The reversal of 77394917 is 71949377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58507201 + 18887716 = 7649^2 + 4346^2 .

It is a cyclic number.

It is not a de Polignac number, because 77394917 - 2¹⁰ = 77393893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77394907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38697458 + 38697459.

It is an arithmetic number, because the mean of its divisors is an integer number (38697459).

Almost surely, 2^77394917 is an apocalyptic number.

It is an amenable number.

77394917 is a deficient number, since it is larger than the sum of its proper divisors (1).

77394917 is an equidigital number, since it uses as much as digits as its factorization.

77394917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 333396, while the sum is 47.

The square root of 77394917 is about 8797.4380929905. The cubic root of 77394917 is about 426.1581642122.

The spelling of 77394917 in words is "seventy-seven million, three hundred ninety-four thousand, nine hundred seventeen".