18939648 has 144 divisors (see below), whose sum is σ = 62268416. Its totient is φ = 4976640.

The previous prime is 18939647. The next prime is 18939653. The reversal of 18939648 is 84693981.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 18939597 and 18939606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939643) 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, 69753 + ... + 70023.

Almost surely, 2^18939648 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 18939648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31134208).

18939648 is an abundant number, since it is smaller than the sum of its proper divisors (43328768).

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

18939648 is a wasteful number, since it uses less digits than its factorization.

18939648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 296 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 18939648 is about 4351.9705881359. The cubic root of 18939648 is about 266.5573329569.

The spelling of 18939648 in words is "eighteen million, nine hundred thirty-nine thousand, six hundred forty-eight".