84391918 has 8 divisors (see below), whose sum is σ = 136325448. Its totient is φ = 38950104.

The previous prime is 84391913. The next prime is 84391919. The reversal of 84391918 is 81919348.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84391913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1622896 + ... + 1622947.

It is an arithmetic number, because the mean of its divisors is an integer number (17040681).

Almost surely, 2^84391918 is an apocalyptic number.

84391918 is a deficient number, since it is larger than the sum of its proper divisors (51933530).

84391918 is a wasteful number, since it uses less digits than its factorization.

84391918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3245858.

The product of its digits is 62208, while the sum is 43.

The square root of 84391918 is about 9186.5073885563. The cubic root of 84391918 is about 438.6319734585.

The spelling of 84391918 in words is "eighty-four million, three hundred ninety-one thousand, nine hundred eighteen".