84308391 has 8 divisors (see below), whose sum is σ = 124901360. Its totient is φ = 56205576.

The previous prime is 84308387. The next prime is 84308401. The reversal of 84308391 is 19380348.

It is not a de Polignac number, because 84308391 - 2² = 84308387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84308351) 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 7 ways as a sum of consecutive naturals, for example, 1561240 + ... + 1561293.

It is an arithmetic number, because the mean of its divisors is an integer number (15612670).

Almost surely, 2^84308391 is an apocalyptic number.

84308391 is a deficient number, since it is larger than the sum of its proper divisors (40592969).

84308391 is a wasteful number, since it uses less digits than its factorization.

84308391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122542 (or 3122536 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 84308391 is about 9181.9600848621. The cubic root of 84308391 is about 438.4872135189.

The spelling of 84308391 in words is "eighty-four million, three hundred eight thousand, three hundred ninety-one".