18669040 has 80 divisors (see below), whose sum is σ = 48434400. Its totient is φ = 6644736.

The previous prime is 18669029. The next prime is 18669047. The reversal of 18669040 is 4096681.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 18668987 and 18669005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18669047) 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, 29851 + ... + 30469.

It is an arithmetic number, because the mean of its divisors is an integer number (605430).

Almost surely, 2^18669040 is an apocalyptic number.

18669040 is a gapful number since it is divisible by the number (10) 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 18669040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24217200).

18669040 is an abundant number, since it is smaller than the sum of its proper divisors (29765360).

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

18669040 is a wasteful number, since it uses less digits than its factorization.

18669040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 18669040 is about 4320.7684501718. The cubic root of 18669040 is about 265.2817224656.

The spelling of 18669040 in words is "eighteen million, six hundred sixty-nine thousand, forty".