18536540 has 48 divisors (see below), whose sum is σ = 42910560. Its totient is φ = 6670080.

The previous prime is 18536527. The next prime is 18536599. The reversal of 18536540 is 4563581.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18536497 and 18536506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23594 + ... + 24366.

It is an arithmetic number, because the mean of its divisors is an integer number (893970).

Almost surely, 2^18536540 is an apocalyptic number.

18536540 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 18536540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21455280).

18536540 is an abundant number, since it is smaller than the sum of its proper divisors (24374020).

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

18536540 is a wasteful number, since it uses less digits than its factorization.

18536540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902 (or 900 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 18536540 is about 4305.4082268700. The cubic root of 18536540 is about 264.6526361262.

The spelling of 18536540 in words is "eighteen million, five hundred thirty-six thousand, five hundred forty".