18818540 has 24 divisors (see below), whose sum is σ = 42559440. Its totient is φ = 6948288.

The previous prime is 18818539. The next prime is 18818567. The reversal of 18818540 is 4581881.

It is a self number, because there is not a number n which added to its sum of digits gives 18818540.

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, 35930 + ... + 36449.

It is an arithmetic number, because the mean of its divisors is an integer number (1773310).

Almost surely, 2^18818540 is an apocalyptic number.

18818540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18818540 is an abundant number, since it is smaller than the sum of its proper divisors (23740900).

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

18818540 is a wasteful number, since it uses less digits than its factorization.

18818540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72401 (or 72399 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 35.

The square root of 18818540 is about 4338.0341169705. The cubic root of 18818540 is about 265.9879580732.

The spelling of 18818540 in words is "eighteen million, eight hundred eighteen thousand, five hundred forty".