2019709640 has 128 divisors (see below), whose sum is σ = 5140800000. Its totient is φ = 708922368.

The previous prime is 2019709607. The next prime is 2019709717. The reversal of 2019709640 is 469079102.

It is a junction number, because it is equal to n+sod(n) for n = 2019709594 and 2019709603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1009361 + ... + 1011359.

It is an arithmetic number, because the mean of its divisors is an integer number (40162500).

Almost surely, 2^2019709640 is an apocalyptic number.

2019709640 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 2019709640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2570400000).

2019709640 is an abundant number, since it is smaller than the sum of its proper divisors (3121090360).

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

2019709640 is a wasteful number, since it uses less digits than its factorization.

2019709640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 2019709640 is about 44941.1797797966. The cubic root of 2019709640 is about 1264.0462933026.

The spelling of 2019709640 in words is "two billion, nineteen million, seven hundred nine thousand, six hundred forty".