84218807 has 2 divisors, whose sum is σ = 84218808. Its totient is φ = 84218806.

The previous prime is 84218777. The next prime is 84218809. The reversal of 84218807 is 70881248.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84218807 - 2¹⁴ = 84202423 is a prime.

Together with 84218809, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84218809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42109403 + 42109404.

It is an arithmetic number, because the mean of its divisors is an integer number (42109404).

Almost surely, 2^84218807 is an apocalyptic number.

84218807 is a deficient number, since it is larger than the sum of its proper divisors (1).

84218807 is an equidigital number, since it uses as much as digits as its factorization.

84218807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 84218807 is about 9177.0805270522. The cubic root of 84218807 is about 438.3318499406.

The spelling of 84218807 in words is "eighty-four million, two hundred eighteen thousand, eight hundred seven".