49818 has 24 divisors (see below), whose sum is σ = 109728. Its totient is φ = 15048.

The previous prime is 49811. The next prime is 49823. The reversal of 49818 is 81894.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 11.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49811) 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 11 ways as a sum of consecutive naturals, for example, 2155 + ... + 2177.

It is an arithmetic number, because the mean of its divisors is an integer number (4572).

2⁴⁹⁸¹⁸ is an apocalyptic number.

49818 is an abundant number, since it is smaller than the sum of its proper divisors (59910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54864).

49818 is a wasteful number, since it uses less digits than its factorization.

49818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 47 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 49818 is about 223.1994623649. The cubic root of 49818 is about 36.7955610588.

The spelling of 49818 in words is "forty-nine thousand, eight hundred eighteen".