18541540 has 12 divisors (see below), whose sum is σ = 38937276. Its totient is φ = 7416608.

The previous prime is 18541531. The next prime is 18541541. The reversal of 18541540 is 4514581.

It can be written as a sum of positive squares in 2 ways, for example, as 13424896 + 5116644 = 3664^2 + 2262^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18541499 and 18541508.

It is not an unprimeable number, because it can be changed into a prime (18541541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463519 + ... + 463558.

It is an arithmetic number, because the mean of its divisors is an integer number (3244773).

Almost surely, 2^18541540 is an apocalyptic number.

18541540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18541540 is an abundant number, since it is smaller than the sum of its proper divisors (20395736).

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

18541540 is a wasteful number, since it uses less digits than its factorization.

18541540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927086 (or 927084 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 18541540 is about 4305.9888527492. The cubic root of 18541540 is about 264.6764295674.

The spelling of 18541540 in words is "eighteen million, five hundred forty-one thousand, five hundred forty".