2019940 has 48 divisors (see below), whose sum is σ = 4847472. Its totient is φ = 700416.

The previous prime is 2019931. The next prime is 2019959. The reversal of 2019940 is 499102.

It can be written as a sum of positive squares in 8 ways, for example, as 14884 + 2005056 = 122^2 + 1416^2 .

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, 4192 + ... + 4648.

It is an arithmetic number, because the mean of its divisors is an integer number (100989).

2^2019940 is an apocalyptic number.

2019940 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 2019940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2423736).

2019940 is an abundant number, since it is smaller than the sum of its proper divisors (2827532).

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

2019940 is a wasteful number, since it uses less digits than its factorization.

2019940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 2019940 is about 1421.2459322721. The cubic root of 2019940 is about 126.4094348830.

The spelling of 2019940 in words is "two million, nineteen thousand, nine hundred forty".