83439891 has 6 divisors (see below), whose sum is σ = 120524300. Its totient is φ = 55626588.

The previous prime is 83439877. The next prime is 83439907. The reversal of 83439891 is 19893438.

It is not a de Polignac number, because 83439891 - 2¹⁰ = 83438867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83439821) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 4635541 + ... + 4635558.

Almost surely, 2^83439891 is an apocalyptic number.

83439891 is a deficient number, since it is larger than the sum of its proper divisors (37084409).

83439891 is a wasteful number, since it uses less digits than its factorization.

83439891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9271105 (or 9271102 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 83439891 is about 9134.5438309748. The cubic root of 83439891 is about 436.9763264636.

The spelling of 83439891 in words is "eighty-three million, four hundred thirty-nine thousand, eight hundred ninety-one".