19845144 has 48 divisors (see below), whose sum is σ = 58635720. Its totient is φ = 6013440.

The previous prime is 19845143. The next prime is 19845167. The reversal of 19845144 is 44154891.

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 = 19845099 and 19845108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19845143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11737 + ... + 13320.

Almost surely, 2^19845144 is an apocalyptic number.

It is an amenable number.

19845144 is an abundant number, since it is smaller than the sum of its proper divisors (38790576).

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

19845144 is a wasteful number, since it uses less digits than its factorization.

19845144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25080 (or 25073 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 19845144 is about 4454.7888838866. The cubic root of 19845144 is about 270.7393726182.

The spelling of 19845144 in words is "nineteen million, eight hundred forty-five thousand, one hundred forty-four".