84478417 has 2 divisors, whose sum is σ = 84478418. Its totient is φ = 84478416.

The previous prime is 84478399. The next prime is 84478451. The reversal of 84478417 is 71487448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56610576 + 27867841 = 7524^2 + 5279^2 .

It is a cyclic number.

It is not a de Polignac number, because 84478417 - 2¹¹ = 84476369 is a prime.

It is not a weakly prime, because it can be changed into another prime (84478477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42239208 + 42239209.

It is an arithmetic number, because the mean of its divisors is an integer number (42239209).

Almost surely, 2^84478417 is an apocalyptic number.

It is an amenable number.

84478417 is a deficient number, since it is larger than the sum of its proper divisors (1).

84478417 is an equidigital number, since it uses as much as digits as its factorization.

84478417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 200704, while the sum is 43.

The square root of 84478417 is about 9191.2141200170. The cubic root of 84478417 is about 438.7817835055.

The spelling of 84478417 in words is "eighty-four million, four hundred seventy-eight thousand, four hundred seventeen".