89818 has 4 divisors (see below), whose sum is σ = 134730. Its totient is φ = 44908.

The previous prime is 89809. The next prime is 89819. The reversal of 89818 is 81898.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81898 = 2 ⋅40949.

It can be written as a sum of positive squares in only one way, i.e., 85849 + 3969 = 293^2 + 63^2 .

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

It is not an unprimeable number, because it can be changed into a prime (89819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22453 + ... + 22456.

2⁸⁹⁸¹⁸ is an apocalyptic number.

89818 is a deficient number, since it is larger than the sum of its proper divisors (44912).

89818 is a wasteful number, since it uses less digits than its factorization.

89818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44911.

The product of its digits is 4608, while the sum is 34.

The square root of 89818 is about 299.6965131596. The cubic root of 89818 is about 44.7838190927.

The spelling of 89818 in words is "eighty-nine thousand, eight hundred eighteen".