18549040 has 80 divisors (see below), whose sum is σ = 47729088. Its totient is φ = 6668288.

The previous prime is 18549007. The next prime is 18549053. The reversal of 18549040 is 4094581.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 18548993 and 18549011.

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, 30984 + ... + 31576.

Almost surely, 2^18549040 is an apocalyptic number.

18549040 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 18549040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23864544).

18549040 is an abundant number, since it is smaller than the sum of its proper divisors (29180048).

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

18549040 is a wasteful number, since it uses less digits than its factorization.

18549040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 18549040 is about 4306.8596447992. The cubic root of 18549040 is about 264.7121117101.

The spelling of 18549040 in words is "eighteen million, five hundred forty-nine thousand, forty".