22123818 has 48 divisors (see below), whose sum is σ = 49350600. Its totient is φ = 7160832.

The previous prime is 22123807. The next prime is 22123819. The reversal of 22123818 is 81832122.

It can be written as a sum of positive squares in 4 ways, for example, as 8485569 + 13638249 = 2913^2 + 3693^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22123791 and 22123800.

It is not an unprimeable number, because it can be changed into a prime (22123819) 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 in 23 ways as a sum of consecutive naturals, for example, 148408 + ... + 148556.

Almost surely, 2^22123818 is an apocalyptic number.

22123818 is an abundant number, since it is smaller than the sum of its proper divisors (27226782).

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

22123818 is a wasteful number, since it uses less digits than its factorization.

22123818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 340 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 22123818 is about 4703.5962836961. The cubic root of 22123818 is about 280.7286210321.

The spelling of 22123818 in words is "twenty-two million, one hundred twenty-three thousand, eight hundred eighteen".