18338540 has 24 divisors (see below), whose sum is σ = 42012432. Its totient is φ = 6668480.

The previous prime is 18338531. The next prime is 18338561. The reversal of 18338540 is 4583381.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18338497 and 18338506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41459 + ... + 41898.

It is an arithmetic number, because the mean of its divisors is an integer number (1750518).

Almost surely, 2^18338540 is an apocalyptic number.

18338540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18338540 is an abundant number, since it is smaller than the sum of its proper divisors (23673892).

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

18338540 is a wasteful number, since it uses less digits than its factorization.

18338540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83377 (or 83375 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 18338540 is about 4282.3521574014. The cubic root of 18338540 is about 263.7069559818.

The spelling of 18338540 in words is "eighteen million, three hundred thirty-eight thousand, five hundred forty".