84218143 has 4 divisors (see below), whose sum is σ = 85052088. Its totient is φ = 83384200.

The previous prime is 84218137. The next prime is 84218149. The reversal of 84218143 is 34181248.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (84218137) and next prime (84218149).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84218143 is a prime.

It is a super-2 number, since 2×84218143² = 14185391220736898, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84218149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416821 + ... + 417022.

It is an arithmetic number, because the mean of its divisors is an integer number (21263022).

Almost surely, 2^84218143 is an apocalyptic number.

84218143 is a deficient number, since it is larger than the sum of its proper divisors (833945).

84218143 is a wasteful number, since it uses less digits than its factorization.

84218143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833944.

The product of its digits is 6144, while the sum is 31.

The square root of 84218143 is about 9177.0443498983. The cubic root of 84218143 is about 438.3306979686.

The spelling of 84218143 in words is "eighty-four million, two hundred eighteen thousand, one hundred forty-three".