18325440 has 280 divisors, whose sum is σ = 75236832. Its totient is φ = 4147200.

The previous prime is 18325429. The next prime is 18325499. The reversal of 18325440 is 4452381.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 181390 + ... + 181490.

Almost surely, 2^18325440 is an apocalyptic number.

18325440 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 18325440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37618416).

18325440 is an abundant number, since it is smaller than the sum of its proper divisors (56911392).

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

18325440 is a wasteful number, since it uses less digits than its factorization.

18325440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 18325440 is about 4280.8223509041. The cubic root of 18325440 is about 263.6441486549.

The spelling of 18325440 in words is "eighteen million, three hundred twenty-five thousand, four hundred forty".