18999648 has 72 divisors (see below), whose sum is σ = 55521648. Its totient is φ = 6158592.

The previous prime is 18999641. The next prime is 18999653. The reversal of 18999648 is 84699981.

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 18999594 and 18999603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18999641) 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, 9765 + ... + 11547.

It is an arithmetic number, because the mean of its divisors is an integer number (771134).

Almost surely, 2^18999648 is an apocalyptic number.

18999648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18999648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27760824).

18999648 is an abundant number, since it is smaller than the sum of its proper divisors (36522000).

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

18999648 is a wasteful number, since it uses less digits than its factorization.

18999648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836 (or 1825 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 18999648 is about 4358.8585661845. The cubic root of 18999648 is about 266.8385170070.

The spelling of 18999648 in words is "eighteen million, nine hundred ninety-nine thousand, six hundred forty-eight".