86819 has 4 divisors (see below), whose sum is σ = 91944. Its totient is φ = 81696.

The previous prime is 86813. The next prime is 86837. The reversal of 86819 is 91868.

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 86819 - 2¹² = 82723 is a prime.

It is a super-2 number, since 2×86819² = 15075077522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 86819.

It is not an unprimeable number, because it can be changed into a prime (86813) 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, 2537 + ... + 2570.

It is an arithmetic number, because the mean of its divisors is an integer number (22986).

2⁸⁶⁸¹⁹ is an apocalyptic number.

86819 is a deficient number, since it is larger than the sum of its proper divisors (5125).

86819 is a wasteful number, since it uses less digits than its factorization.

86819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124.

The product of its digits is 3456, while the sum is 32.

The square root of 86819 is about 294.6506405898. The cubic root of 86819 is about 44.2797261613.

The spelling of 86819 in words is "eighty-six thousand, eight hundred nineteen".