82138187 has 16 divisors (see below), whose sum is σ = 87004800. Its totient is φ = 77447808.

The previous prime is 82138183. The next prime is 82138193. The reversal of 82138187 is 78183128.

It is not a de Polignac number, because 82138187 - 2² = 82138183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82138187.

It is not an unprimeable number, because it can be changed into a prime (82138183) 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 15 ways as a sum of consecutive naturals, for example, 258953 + ... + 259269.

It is an arithmetic number, because the mean of its divisors is an integer number (5437800).

Almost surely, 2^82138187 is an apocalyptic number.

82138187 is a deficient number, since it is larger than the sum of its proper divisors (4866613).

82138187 is a wasteful number, since it uses less digits than its factorization.

82138187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550.

The product of its digits is 21504, while the sum is 38.

The square root of 82138187 is about 9063.0120269147. The cubic root of 82138187 is about 434.6920566825.

It can be divided in two parts, 8213818 and 7, that multiplied together give a triangular number (57496726 = T₁₀₇₂₃).

The spelling of 82138187 in words is "eighty-two million, one hundred thirty-eight thousand, one hundred eighty-seven".