49865 has 4 divisors (see below), whose sum is σ = 59844. Its totient is φ = 39888.

The previous prime is 49853. The next prime is 49871. The reversal of 49865 is 56894.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56894 = 2 ⋅28447.

It can be written as a sum of positive squares in 2 ways, for example, as 11449 + 38416 = 107^2 + 196^2 .

It is a cyclic number.

It is not a de Polignac number, because 49865 - 2⁶ = 49801 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is an unprimeable number.

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, 4982 + ... + 4991.

It is an arithmetic number, because the mean of its divisors is an integer number (14961).

2⁴⁹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

49865 is a deficient number, since it is larger than the sum of its proper divisors (9979).

49865 is an equidigital number, since it uses as much as digits as its factorization.

49865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9978.

The product of its digits is 8640, while the sum is 32.

The square root of 49865 is about 223.3047245358. The cubic root of 49865 is about 36.8071288174.

The spelling of 49865 in words is "forty-nine thousand, eight hundred sixty-five".