19042540 has 48 divisors (see below), whose sum is σ = 44108064. Its totient is φ = 6848000.

The previous prime is 19042523. The next prime is 19042549. The reversal of 19042540 is 4524091.

It is not an unprimeable number, because it can be changed into a prime (19042549) 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, 21792 + ... + 22648.

It is an arithmetic number, because the mean of its divisors is an integer number (918918).

Almost surely, 2^19042540 is an apocalyptic number.

19042540 is a gapful number since it is divisible by the number (10) 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 19042540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22054032).

19042540 is an abundant number, since it is smaller than the sum of its proper divisors (25065524).

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

19042540 is a wasteful number, since it uses less digits than its factorization.

19042540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978 (or 976 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 19042540 is about 4363.7758879209. The cubic root of 19042540 is about 267.0391634585.

It can be divided in two parts, 1904 and 2540, that added together give a palindrome (4444).

The spelling of 19042540 in words is "nineteen million, forty-two thousand, five hundred forty".