18504642 has 32 divisors (see below), whose sum is σ = 40541760. Its totient is φ = 5595840.

The previous prime is 18504641. The next prime is 18504649. The reversal of 18504642 is 24640581.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18504641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2592 + ... + 6612.

It is an arithmetic number, because the mean of its divisors is an integer number (1266930).

Almost surely, 2^18504642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18504642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20270880).

18504642 is an abundant number, since it is smaller than the sum of its proper divisors (22037118).

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

18504642 is a wasteful number, since it uses less digits than its factorization.

18504642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 18504642 is about 4301.7022212143. The cubic root of 18504642 is about 264.5007426816.

The spelling of 18504642 in words is "eighteen million, five hundred four thousand, six hundred forty-two".