84123391 has 8 divisors (see below), whose sum is σ = 93141504. Its totient is φ = 75333720.

The previous prime is 84123383. The next prime is 84123407. The reversal of 84123391 is 19332148.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 84123391 - 2³ = 84123383 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 (84123371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56335 + ... + 57808.

It is an arithmetic number, because the mean of its divisors is an integer number (11642688).

Almost surely, 2^84123391 is an apocalyptic number.

84123391 is a deficient number, since it is larger than the sum of its proper divisors (9018113).

84123391 is a wasteful number, since it uses less digits than its factorization.

84123391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114221.

The product of its digits is 5184, while the sum is 31.

The square root of 84123391 is about 9171.8804505946. The cubic root of 84123391 is about 438.1662508380.

The spelling of 84123391 in words is "eighty-four million, one hundred twenty-three thousand, three hundred ninety-one".