18195440 has 60 divisors (see below), whose sum is σ = 44996376. Its totient is φ = 6841344.

The previous prime is 18195421. The next prime is 18195451. The reversal of 18195440 is 4459181.

It is a junction number, because it is equal to n+sod(n) for n = 18195397 and 18195406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22727 + ... + 23513.

Almost surely, 2^18195440 is an apocalyptic number.

18195440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18195440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22498188).

18195440 is an abundant number, since it is smaller than the sum of its proper divisors (26800936).

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

18195440 is a wasteful number, since it uses less digits than its factorization.

18195440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 18195440 is about 4265.6113278169. The cubic root of 18195440 is about 263.0192413166.

The spelling of 18195440 in words is "eighteen million, one hundred ninety-five thousand, four hundred forty".