83919891938 has 4 divisors (see below), whose sum is σ = 125879837910. Its totient is φ = 41959945968.

The previous prime is 83919891931. The next prime is 83919892019.

It is a happy number.

83919891938 is nontrivially palindromic in base 10.

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., 80121265249 + 3798626689 = 283057^2 + 61633^2 .

It is not an unprimeable number, because it can be changed into a prime (83919891931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20979972983 + ... + 20979972986.

Almost surely, 2^83919891938 is an apocalyptic number.

83919891938 is a deficient number, since it is larger than the sum of its proper divisors (41959945972).

83919891938 is a wasteful number, since it uses less digits than its factorization.

83919891938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41959945971.

The product of its digits is 30233088, while the sum is 68.

The spelling of 83919891938 in words is "eighty-three billion, nine hundred nineteen million, eight hundred ninety-one thousand, nine hundred thirty-eight".