84408517 has 2 divisors, whose sum is σ = 84408518. Its totient is φ = 84408516.

The previous prime is 84408509. The next prime is 84408521. The reversal of 84408517 is 71580448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84382596 + 25921 = 9186^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 84408517 - 2³ = 84408509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84408557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42204258 + 42204259.

It is an arithmetic number, because the mean of its divisors is an integer number (42204259).

Almost surely, 2^84408517 is an apocalyptic number.

It is an amenable number.

84408517 is a deficient number, since it is larger than the sum of its proper divisors (1).

84408517 is an equidigital number, since it uses as much as digits as its factorization.

84408517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 84408517 is about 9187.4107886825. The cubic root of 84408517 is about 438.6607296673.

The spelling of 84408517 in words is "eighty-four million, four hundred eight thousand, five hundred seventeen".