84138424 has 8 divisors (see below), whose sum is σ = 157759560. Its totient is φ = 42069208.

The previous prime is 84138419. The next prime is 84138449. The reversal of 84138424 is 42483148.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 84138424.

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 as a sum of consecutive naturals, namely, 5258644 + ... + 5258659.

It is an arithmetic number, because the mean of its divisors is an integer number (19719945).

Almost surely, 2^84138424 is an apocalyptic number.

It is an amenable number.

84138424 is a deficient number, since it is larger than the sum of its proper divisors (73621136).

84138424 is a wasteful number, since it uses less digits than its factorization.

84138424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10517309 (or 10517305 counting only the distinct ones).

The product of its digits is 24576, while the sum is 34.

The square root of 84138424 is about 9172.6999296826. The cubic root of 84138424 is about 438.1923496469.

The spelling of 84138424 in words is "eighty-four million, one hundred thirty-eight thousand, four hundred twenty-four".