2123706840 has 64 divisors (see below), whose sum is σ = 6648134400. Its totient is φ = 541698432.

The previous prime is 2123706811. The next prime is 2123706857. The reversal of 2123706840 is 486073212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381970 + ... + 387489.

It is an arithmetic number, because the mean of its divisors is an integer number (103877100).

Almost surely, 2^2123706840 is an apocalyptic number.

2123706840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2123706840 is an abundant number, since it is smaller than the sum of its proper divisors (4524427560).

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

2123706840 is a wasteful number, since it uses less digits than its factorization.

2123706840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769496 (or 769492 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 2123706840 is about 46083.6938623631. The cubic root of 2123706840 is about 1285.3799519395.

The spelling of 2123706840 in words is "two billion, one hundred twenty-three million, seven hundred six thousand, eight hundred forty".