19875440 has 80 divisors (see below), whose sum is σ = 51559200. Its totient is φ = 7074816.

The previous prime is 19875437. The next prime is 19875467. The reversal of 19875440 is 4457891.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 19875394 and 19875403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29831 + ... + 30489.

It is an arithmetic number, because the mean of its divisors is an integer number (644490).

Almost surely, 2^19875440 is an apocalyptic number.

19875440 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 19875440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25779600).

19875440 is an abundant number, since it is smaller than the sum of its proper divisors (31683760).

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

19875440 is a wasteful number, since it uses less digits than its factorization.

19875440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 708 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 19875440 is about 4458.1879727082. The cubic root of 19875440 is about 270.8770746445.

The spelling of 19875440 in words is "nineteen million, eight hundred seventy-five thousand, four hundred forty".