84081972 has 24 divisors (see below), whose sum is σ = 211283296. Its totient is φ = 25871328.

The previous prime is 84081971. The next prime is 84081989. The reversal of 84081972 is 27918048.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 84081972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84081971) 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 in 7 ways as a sum of consecutive naturals, for example, 269338 + ... + 269649.

Almost surely, 2^84081972 is an apocalyptic number.

It is an amenable number.

84081972 is an abundant number, since it is smaller than the sum of its proper divisors (127201324).

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

84081972 is a wasteful number, since it uses less digits than its factorization.

84081972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539007 (or 539005 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 84081972 is about 9169.6222386748. The cubic root of 84081972 is about 438.0943271750.

The spelling of 84081972 in words is "eighty-four million, eighty-one thousand, nine hundred seventy-two".