83684215 has 4 divisors (see below), whose sum is σ = 100421064. Its totient is φ = 66947368.

The previous prime is 83684197. The next prime is 83684219. The reversal of 83684215 is 51248638.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 83684215 - 2¹⁷ = 83553143 is a prime.

It is a super-3 number, since 3×83684215³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83684219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8368417 + ... + 8368426.

It is an arithmetic number, because the mean of its divisors is an integer number (25105266).

Almost surely, 2^83684215 is an apocalyptic number.

83684215 is a deficient number, since it is larger than the sum of its proper divisors (16736849).

83684215 is a wasteful number, since it uses less digits than its factorization.

83684215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16736848.

The product of its digits is 46080, while the sum is 37.

The square root of 83684215 is about 9147.9076842740. The cubic root of 83684215 is about 437.4024206867.

The spelling of 83684215 in words is "eighty-three million, six hundred eighty-four thousand, two hundred fifteen".