2019540 has 48 divisors (see below), whose sum is σ = 5729472. Its totient is φ = 531456.

The previous prime is 2019533. The next prime is 2019569. The reversal of 2019540 is 459102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5647 + ... + 5993.

It is an arithmetic number, because the mean of its divisors is an integer number (119364).

2^2019540 is an apocalyptic number.

2019540 is a gapful number since it is divisible by the number (20) 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 2019540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2864736).

2019540 is an abundant number, since it is smaller than the sum of its proper divisors (3709932).

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

2019540 is a wasteful number, since it uses less digits than its factorization.

2019540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2019540 is about 1421.1052037059. The cubic root of 2019540 is about 126.4010902272.

The spelling of 2019540 in words is "two million, nineteen thousand, five hundred forty".