84145 has 4 divisors (see below), whose sum is σ = 100980. Its totient is φ = 67312.

The previous prime is 84143. The next prime is 84163. The reversal of 84145 is 54148.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12321 + 71824 = 111^2 + 268^2 .

It is a cyclic number.

It is not a de Polignac number, because 84145 - 2¹ = 84143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8410 + ... + 8419.

It is an arithmetic number, because the mean of its divisors is an integer number (25245).

2⁸⁴¹⁴⁵ is an apocalyptic number.

It is an amenable number.

84145 is a deficient number, since it is larger than the sum of its proper divisors (16835).

84145 is a wasteful number, since it uses less digits than its factorization.

84145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16834.

The product of its digits is 640, while the sum is 22.

The square root of 84145 is about 290.0775758310. The cubic root of 84145 is about 43.8203765271.

The spelling of 84145 in words is "eighty-four thousand, one hundred forty-five".