18223968 has 96 divisors (see below), whose sum is σ = 55931904. Its totient is φ = 5087232.

The previous prime is 18223951. The next prime is 18223969. The reversal of 18223968 is 86932281.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×18223968² = 664226019330048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31296 + ... + 31872.

It is an arithmetic number, because the mean of its divisors is an integer number (582624).

Almost surely, 2^18223968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18223968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27965952).

18223968 is an abundant number, since it is smaller than the sum of its proper divisors (37707936).

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

18223968 is a wasteful number, since it uses less digits than its factorization.

18223968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 636 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 18223968 is about 4268.9539702367. The cubic root of 18223968 is about 263.1566291251.

It can be divided in two parts, 18223 and 968, that added together give a palindrome (19191).

The spelling of 18223968 in words is "eighteen million, two hundred twenty-three thousand, nine hundred sixty-eight".