84173391 has 16 divisors (see below), whose sum is σ = 124871520. Its totient is φ = 56039040.

The previous prime is 84173389. The next prime is 84173393. The reversal of 84173391 is 19337148.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (84173389) and next prime (84173393).

It is not a de Polignac number, because 84173391 - 2¹ = 84173389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84173393) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 23751 + ... + 27063.

It is an arithmetic number, because the mean of its divisors is an integer number (7804470).

Almost surely, 2^84173391 is an apocalyptic number.

84173391 is a deficient number, since it is larger than the sum of its proper divisors (40698129).

84173391 is a wasteful number, since it uses less digits than its factorization.

84173391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4263 (or 4257 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 84173391 is about 9174.6057680971. The cubic root of 84173391 is about 438.2530438738.

The spelling of 84173391 in words is "eighty-four million, one hundred seventy-three thousand, three hundred ninety-one".