18195930 has 48 divisors (see below), whose sum is σ = 47613384. Its totient is φ = 4821120.

The previous prime is 18195893. The next prime is 18195937. The reversal of 18195930 is 3959181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3884841 + 14311089 = 1971^2 + 3783^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18195937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15732 + ... + 16848.

Almost surely, 2^18195930 is an apocalyptic number.

18195930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18195930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23806692).

18195930 is an abundant number, since it is smaller than the sum of its proper divisors (29417454).

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

18195930 is a wasteful number, since it uses less digits than its factorization.

18195930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 18195930 is about 4265.6687635118. The cubic root of 18195930 is about 263.0216023160.

The spelling of 18195930 in words is "eighteen million, one hundred ninety-five thousand, nine hundred thirty".