18545544 has 64 divisors (see below), whose sum is σ = 53769600. Its totient is φ = 5911488.

The previous prime is 18545543. The next prime is 18545591. The reversal of 18545544 is 44554581.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18545499 and 18545508.

It is not an unprimeable number, because it can be changed into a prime (18545543) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3102 + ... + 6834.

It is an arithmetic number, because the mean of its divisors is an integer number (840150).

Almost surely, 2^18545544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18545544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26884800).

18545544 is an abundant number, since it is smaller than the sum of its proper divisors (35224056).

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

18545544 is a wasteful number, since it uses less digits than its factorization.

18545544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3771 (or 3761 counting only the distinct ones).

The product of its digits is 64000, while the sum is 36.

The square root of 18545544 is about 4306.4537615073. The cubic root of 18545544 is about 264.6954802710.

The spelling of 18545544 in words is "eighteen million, five hundred forty-five thousand, five hundred forty-four".