18869844 has 48 divisors (see below), whose sum is σ = 52512768. Its totient is φ = 5156448.

The previous prime is 18869839. The next prime is 18869849. The reversal of 18869844 is 44896881.

It is an interprime number because it is at equal distance from previous prime (18869839) and next prime (18869849).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18869793 and 18869802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18869849) 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, 2952 + ... + 6815.

It is an arithmetic number, because the mean of its divisors is an integer number (1094016).

Almost surely, 2^18869844 is an apocalyptic number.

18869844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18869844 is an abundant number, since it is smaller than the sum of its proper divisors (33642924).

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

18869844 is a wasteful number, since it uses less digits than its factorization.

18869844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9804 (or 9802 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 18869844 is about 4343.9433697966. The cubic root of 18869844 is about 266.2294550922.

The spelling of 18869844 in words is "eighteen million, eight hundred sixty-nine thousand, eight hundred forty-four".