978740417 has 2 divisors, whose sum is σ = 978740418. Its totient is φ = 978740416.

The previous prime is 978740381. The next prime is 978740447. The reversal of 978740417 is 714047879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 939790336 + 38950081 = 30656^2 + 6241^2 .

It is an emirp because it is prime and its reverse (714047879) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978740417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (978740447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489370208 + 489370209.

It is an arithmetic number, because the mean of its divisors is an integer number (489370209).

Almost surely, 2^978740417 is an apocalyptic number.

It is an amenable number.

978740417 is a deficient number, since it is larger than the sum of its proper divisors (1).

978740417 is an equidigital number, since it uses as much as digits as its factorization.

978740417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 978740417 is about 31284.8272649858. The cubic root of 978740417 is about 992.8626517902.

The spelling of 978740417 in words is "nine hundred seventy-eight million, seven hundred forty thousand, four hundred seventeen".