18142644 has 48 divisors (see below), whose sum is σ = 47996480. Its totient is φ = 5287680.

The previous prime is 18142643. The next prime is 18142651. The reversal of 18142644 is 44624181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18142643) 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, 97 + ... + 6024.

Almost surely, 2^18142644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18142644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23998240).

18142644 is an abundant number, since it is smaller than the sum of its proper divisors (29853836).

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

18142644 is a wasteful number, since it uses less digits than its factorization.

18142644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6160 (or 6158 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 18142644 is about 4259.4182701397. The cubic root of 18142644 is about 262.7646021235.

The spelling of 18142644 in words is "eighteen million, one hundred forty-two thousand, six hundred forty-four".