18907944 has 96 divisors (see below), whose sum is σ = 55157760.
Its totient is φ = 5378560.
The previous prime is 18907943. The next prime is 18907957. The reversal of 18907944 is 44970981.
It is a junction number, because it is equal to n+sod(n) for n = 18907896 and 18907905.
It is not an unprimeable number, because it can be changed into a prime (18907943) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49177 + ... + 49559.
It is an arithmetic number, because the mean of its divisors is an integer number (574560).
Almost surely, 218907944 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 18907944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27578880).
18907944 is an abundant number, since it is smaller than the sum of its proper divisors (36249816).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18907944 is a wasteful number, since it uses less digits than its factorization.
18907944 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 431 (or 416 counting only the distinct ones).
The product of its (nonzero) digits is 72576, while the sum is 42.
The square root of 18907944 is about 4348.3265746721.
The cubic root of 18907944 is about 266.4085154507.
The spelling of 18907944 in words is "eighteen million, nine hundred seven thousand, nine hundred forty-four".