84219755 has 4 divisors (see below), whose sum is σ = 101063712. Its totient is φ = 67375800.

The previous prime is 84219749. The next prime is 84219827. The reversal of 84219755 is 55791248.

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

It is a de Polignac number, because none of the positive numbers 2^k-84219755 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 8421971 + ... + 8421980.

It is an arithmetic number, because the mean of its divisors is an integer number (25265928).

Almost surely, 2^84219755 is an apocalyptic number.

84219755 is a deficient number, since it is larger than the sum of its proper divisors (16843957).

84219755 is a wasteful number, since it uses less digits than its factorization.

84219755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16843956.

The product of its digits is 100800, while the sum is 41.

The square root of 84219755 is about 9177.1321773199. The cubic root of 84219755 is about 438.3334946130. Note that the first 3 decimals are identical.

The spelling of 84219755 in words is "eighty-four million, two hundred nineteen thousand, seven hundred fifty-five".