18623844 has 60 divisors (see below), whose sum is σ = 49762944. Its totient is φ = 6070896.

The previous prime is 18623831. The next prime is 18623851. The reversal of 18623844 is 44832681.

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 = 18623799 and 18623808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14617 + ... + 15839.

Almost surely, 2^18623844 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 18623844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24881472).

18623844 is an abundant number, since it is smaller than the sum of its proper divisors (31139100).

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

18623844 is a wasteful number, since it uses less digits than its factorization.

18623844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1275 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 18623844 is about 4315.5351927658. The cubic root of 18623844 is about 265.0674754010.

The spelling of 18623844 in words is "eighteen million, six hundred twenty-three thousand, eight hundred forty-four".