84187391 has 8 divisors (see below), whose sum is σ = 86368464. Its totient is φ = 82012480.

The previous prime is 84187379. The next prime is 84187393. The reversal of 84187391 is 19378148.

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

It is not a de Polignac number, because 84187391 - 2¹⁰ = 84186367 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84187393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40520 + ... + 42546.

It is an arithmetic number, because the mean of its divisors is an integer number (10796058).

Almost surely, 2^84187391 is an apocalyptic number.

84187391 is a deficient number, since it is larger than the sum of its proper divisors (2181073).

84187391 is a wasteful number, since it uses less digits than its factorization.

84187391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081.

The product of its digits is 48384, while the sum is 41.

The square root of 84187391 is about 9175.3687119374. The cubic root of 84187391 is about 438.2773397644.

84187391 divided by its sum of digits (41) gives a triangular number (2053351 = T₂₀₂₆).

The spelling of 84187391 in words is "eighty-four million, one hundred eighty-seven thousand, three hundred ninety-one".