18039648 has 72 divisors (see below), whose sum is σ = 52083864. Its totient is φ = 5463040.

The previous prime is 18039643. The next prime is 18039667. The reversal of 18039648 is 84693081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10840 + ... + 12392.

It is an arithmetic number, because the mean of its divisors is an integer number (723387).

Almost surely, 2^18039648 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 18039648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26041932).

18039648 is an abundant number, since it is smaller than the sum of its proper divisors (34044216).

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

18039648 is a wasteful number, since it uses less digits than its factorization.

18039648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588 (or 1569 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18039648 is about 4247.3106785353. The cubic root of 18039648 is about 262.2664189710.

The spelling of 18039648 in words is "eighteen million, thirty-nine thousand, six hundred forty-eight".