18709344 has 72 divisors (see below), whose sum is σ = 53660880. Its totient is φ = 6183168.

The previous prime is 18709331. The next prime is 18709349. The reversal of 18709344 is 44390781.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18709299 and 18709308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18709349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47902 + ... + 48290.

It is an arithmetic number, because the mean of its divisors is an integer number (745290).

Almost surely, 2^18709344 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 18709344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26830440).

18709344 is an abundant number, since it is smaller than the sum of its proper divisors (34951536).

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

18709344 is a wasteful number, since it uses less digits than its factorization.

18709344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 18709344 is about 4325.4299208287. The cubic root of 18709344 is about 265.4724880256.

The spelling of 18709344 in words is "eighteen million, seven hundred nine thousand, three hundred forty-four".