84815 has 4 divisors (see below), whose sum is σ = 101784. Its totient is φ = 67848.

The previous prime is 84811. The next prime is 84827. The reversal of 84815 is 51848.

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 84815 - 2² = 84811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 84815.

It is not an unprimeable number, because it can be changed into a prime (84811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8477 + ... + 8486.

It is an arithmetic number, because the mean of its divisors is an integer number (25446).

2⁸⁴⁸¹⁵ is an apocalyptic number.

84815 is a deficient number, since it is larger than the sum of its proper divisors (16969).

84815 is a wasteful number, since it uses less digits than its factorization.

84815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16968.

The product of its digits is 1280, while the sum is 26.

The square root of 84815 is about 291.2301495381. The cubic root of 84815 is about 43.9363749833.

It can be divided in two parts, 848 and 15, that multiplied together give a triangular number (12720 = T₁₅₉).

The spelling of 84815 in words is "eighty-four thousand, eight hundred fifteen".