84391986 has 16 divisors (see below), whose sum is σ = 192896064. Its totient is φ = 24111984.

The previous prime is 84391963. The next prime is 84391997. The reversal of 84391986 is 68919348.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1004625 + ... + 1004708.

It is an arithmetic number, because the mean of its divisors is an integer number (12056004).

Almost surely, 2^84391986 is an apocalyptic number.

84391986 is an abundant number, since it is smaller than the sum of its proper divisors (108504078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84391986 is a wasteful number, since it uses less digits than its factorization.

84391986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009345.

The product of its digits is 373248, while the sum is 48.

The square root of 84391986 is about 9186.5110896357. The cubic root of 84391986 is about 438.6320912698.

It can be divided in two parts, 843 and 91986, that added together give a palindrome (92829).

The spelling of 84391986 in words is "eighty-four million, three hundred ninety-one thousand, nine hundred eighty-six".