84139872 has 48 divisors (see below), whose sum is σ = 226264752. Its totient is φ = 27361280.

The previous prime is 84139843. The next prime is 84139879. The reversal of 84139872 is 27893148.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84139879) 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, 6753 + ... + 14624.

It is an arithmetic number, because the mean of its divisors is an integer number (4713849).

Almost surely, 2^84139872 is an apocalyptic number.

84139872 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

84139872 is an abundant number, since it is smaller than the sum of its proper divisors (142124880).

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

84139872 is a wasteful number, since it uses less digits than its factorization.

84139872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21431 (or 21423 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 84139872 is about 9172.7788592116. The cubic root of 84139872 is about 438.1948633573.

The spelling of 84139872 in words is "eighty-four million, one hundred thirty-nine thousand, eight hundred seventy-two".