2019840 has 80 divisors (see below), whose sum is σ = 6481728. Its totient is φ = 536576.

The previous prime is 2019827. The next prime is 2019847. The reversal of 2019840 is 489102.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 2019840.

It is not an unprimeable number, because it can be changed into a prime (2019847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7549 + ... + 7811.

2^2019840 is an apocalyptic number.

2019840 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 2019840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3240864).

2019840 is an abundant number, since it is smaller than the sum of its proper divisors (4461888).

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

2019840 is an equidigital number, since it uses as much as digits as its factorization.

2019840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2019840 is about 1421.2107514370. The cubic root of 2019840 is about 126.4073488223.

The spelling of 2019840 in words is "two million, nineteen thousand, eight hundred forty".