18021246 has 16 divisors (see below), whose sum is σ = 36283008. Its totient is φ = 5967000.

The previous prime is 18021239. The next prime is 18021247. The reversal of 18021246 is 64212081.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9040 + ... + 10851.

It is an arithmetic number, because the mean of its divisors is an integer number (2267688).

Almost surely, 2^18021246 is an apocalyptic number.

18021246 is an abundant number, since it is smaller than the sum of its proper divisors (18261762).

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

18021246 is a wasteful number, since it uses less digits than its factorization.

18021246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20047.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 18021246 is about 4245.1438138183. The cubic root of 18021246 is about 262.1772104930.

The spelling of 18021246 in words is "eighteen million, twenty-one thousand, two hundred forty-six".