18509648 has 20 divisors (see below), whose sum is σ = 37750560. Its totient is φ = 8767584.

The previous prime is 18509639. The next prime is 18509663. The reversal of 18509648 is 84690581.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30140 + ... + 30747.

It is an arithmetic number, because the mean of its divisors is an integer number (1887528).

Almost surely, 2^18509648 is an apocalyptic number.

It is an amenable number.

18509648 is an abundant number, since it is smaller than the sum of its proper divisors (19240912).

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

18509648 is a wasteful number, since it uses less digits than its factorization.

18509648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60914 (or 60908 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 18509648 is about 4302.2840445512. The cubic root of 18509648 is about 264.5245920367.

The spelling of 18509648 in words is "eighteen million, five hundred nine thousand, six hundred forty-eight".