83981138 has 4 divisors (see below), whose sum is σ = 125971710. Its totient is φ = 41990568.

The previous prime is 83981123. The next prime is 83981179. The reversal of 83981138 is 83118938.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 42159049 + 41822089 = 6493^2 + 6467^2 .

It is a junction number, because it is equal to n+sod(n) for n = 83981095 and 83981104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20995283 + ... + 20995286.

Almost surely, 2^83981138 is an apocalyptic number.

83981138 is a deficient number, since it is larger than the sum of its proper divisors (41990572).

83981138 is a wasteful number, since it uses less digits than its factorization.

83981138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41990571.

The product of its digits is 41472, while the sum is 41.

The square root of 83981138 is about 9164.1223256785. The cubic root of 83981138 is about 437.9191311817.

The spelling of 83981138 in words is "eighty-three million, nine hundred eighty-one thousand, one hundred thirty-eight".