84418819 has 2 divisors, whose sum is σ = 84418820. Its totient is φ = 84418818.

The previous prime is 84418813. The next prime is 84418823. The reversal of 84418819 is 91881448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84418819 - 2³ = 84418811 is a prime.

It is a super-2 number, since 2×84418819² = 14253074002709522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84418811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42209409 + 42209410.

It is an arithmetic number, because the mean of its divisors is an integer number (42209410).

Almost surely, 2^84418819 is an apocalyptic number.

84418819 is a deficient number, since it is larger than the sum of its proper divisors (1).

84418819 is an equidigital number, since it uses as much as digits as its factorization.

84418819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 43.

The square root of 84418819 is about 9187.9714300818. The cubic root of 84418819 is about 438.6785750189.

The spelling of 84418819 in words is "eighty-four million, four hundred eighteen thousand, eight hundred nineteen".