19518044 has 72 divisors (see below), whose sum is σ = 44523360. Its totient is φ = 7281792.

The previous prime is 19518041. The next prime is 19518047. The reversal of 19518044 is 44081591.

It is an interprime number because it is at equal distance from previous prime (19518041) and next prime (19518047).

It is a self number, because there is not a number n which added to its sum of digits gives 19518044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19518041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 453887 + ... + 453929.

It is an arithmetic number, because the mean of its divisors is an integer number (618380).

Almost surely, 2^19518044 is an apocalyptic number.

19518044 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 19518044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22261680).

19518044 is an abundant number, since it is smaller than the sum of its proper divisors (25005316).

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

19518044 is a wasteful number, since it uses less digits than its factorization.

19518044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 19518044 is about 4417.9230414302. The cubic root of 19518044 is about 269.2436261113.

The spelling of 19518044 in words is "nineteen million, five hundred eighteen thousand, forty-four".