84172983838 has 4 divisors (see below), whose sum is σ = 126259475760. Its totient is φ = 42086491918.

The previous prime is 84172983821. The next prime is 84172983857. The reversal of 84172983838 is 83838927148.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21043245958 + ... + 21043245961.

It is an arithmetic number, because the mean of its divisors is an integer number (31564868940).

Almost surely, 2^84172983838 is an apocalyptic number.

84172983838 is a deficient number, since it is larger than the sum of its proper divisors (42086491922).

84172983838 is a wasteful number, since it uses less digits than its factorization.

84172983838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42086491921.

The product of its digits is 18579456, while the sum is 61.

The spelling of 84172983838 in words is "eighty-four billion, one hundred seventy-two million, nine hundred eighty-three thousand, eight hundred thirty-eight".