18195424 has 48 divisors (see below), whose sum is σ = 38949120. Its totient is φ = 8317440.

The previous prime is 18195421. The next prime is 18195451. The reversal of 18195424 is 42459181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18195424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18195421) 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 7 ways as a sum of consecutive naturals, for example, 79342 + ... + 79570.

It is an arithmetic number, because the mean of its divisors is an integer number (811440).

Almost surely, 2^18195424 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 18195424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19474560).

18195424 is an abundant number, since it is smaller than the sum of its proper divisors (20753696).

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

18195424 is a wasteful number, since it uses less digits than its factorization.

18195424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 435 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 18195424 is about 4265.6094523526. The cubic root of 18195424 is about 263.0191642220.

The spelling of 18195424 in words is "eighteen million, one hundred ninety-five thousand, four hundred twenty-four".