18534642 has 48 divisors (see below), whose sum is σ = 45012672. Its totient is φ = 5063520.

The previous prime is 18534631. The next prime is 18534697. The reversal of 18534642 is 24643581.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5392 + ... + 8132.

It is an arithmetic number, because the mean of its divisors is an integer number (937764).

Almost surely, 2^18534642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18534642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22506336).

18534642 is an abundant number, since it is smaller than the sum of its proper divisors (26478030).

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

18534642 is a wasteful number, since it uses less digits than its factorization.

18534642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783 (or 2776 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 18534642 is about 4305.1878007817. The cubic root of 18534642 is about 264.6436030156.

The spelling of 18534642 in words is "eighteen million, five hundred thirty-four thousand, six hundred forty-two".