84138420 has 48 divisors (see below), whose sum is σ = 236291328. Its totient is φ = 22369920.

The previous prime is 84138419. The next prime is 84138449. The reversal of 84138420 is 2483148.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 20110 + ... + 23930.

It is an arithmetic number, because the mean of its divisors is an integer number (4922736).

Almost surely, 2^84138420 is an apocalyptic number.

It is an amenable number.

84138420 is an abundant number, since it is smaller than the sum of its proper divisors (152152908).

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

84138420 is a wasteful number, since it uses less digits than its factorization.

84138420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200 (or 4198 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 84138420 is about 9172.6997116443. The cubic root of 84138420 is about 438.1923427029.

The spelling of 84138420 in words is "eighty-four million, one hundred thirty-eight thousand, four hundred twenty".