18354644 has 48 divisors (see below), whose sum is σ = 41803776. Its totient is φ = 6837600.

The previous prime is 18354641. The next prime is 18354647. The reversal of 18354644 is 44645381.

It is an interprime number because it is at equal distance from previous prime (18354641) and next prime (18354647).

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18354641) 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, 5789 + ... + 8379.

It is an arithmetic number, because the mean of its divisors is an integer number (870912).

Almost surely, 2^18354644 is an apocalyptic number.

18354644 is a gapful number since it is divisible by the number (14) 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 18354644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20901888).

18354644 is an abundant number, since it is smaller than the sum of its proper divisors (23449132).

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

18354644 is a wasteful number, since it uses less digits than its factorization.

18354644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636 (or 2634 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 18354644 is about 4284.2320198607. The cubic root of 18354644 is about 263.7841248719.

The spelling of 18354644 in words is "eighteen million, three hundred fifty-four thousand, six hundred forty-four".