19438540 has 48 divisors (see below), whose sum is σ = 44906400. Its totient is φ = 7009280.

The previous prime is 19438511. The next prime is 19438541. The reversal of 19438540 is 4583491.

It is a plaindrome in base 16.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 19438496 and 19438505.

It is not an unprimeable number, because it can be changed into a prime (19438541) 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, 32484 + ... + 33076.

It is an arithmetic number, because the mean of its divisors is an integer number (935550).

Almost surely, 2^19438540 is an apocalyptic number.

19438540 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 19438540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22453200).

19438540 is an abundant number, since it is smaller than the sum of its proper divisors (25467860).

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

19438540 is a wasteful number, since it uses less digits than its factorization.

19438540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 19438540 is about 4408.9159665387. The cubic root of 19438540 is about 268.8775532968.

The spelling of 19438540 in words is "nineteen million, four hundred thirty-eight thousand, five hundred forty".