1874785721 has 16 divisors (see below), whose sum is σ = 2052222480. Its totient is φ = 1705605120.

The previous prime is 1874785697. The next prime is 1874785723. The reversal of 1874785721 is 1275874781.

It can be written as a sum of positive squares in 8 ways, for example, as 48163600 + 1826622121 = 6940^2 + 42739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1874785721 - 2¹⁰ = 1874784697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1874785721.

It is not an unprimeable number, because it can be changed into a prime (1874785723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63635 + ... + 88311.

It is an arithmetic number, because the mean of its divisors is an integer number (128263905).

Almost surely, 2^1874785721 is an apocalyptic number.

It is an amenable number.

1874785721 is a deficient number, since it is larger than the sum of its proper divisors (177436759).

1874785721 is a wasteful number, since it uses less digits than its factorization.

1874785721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24844.

The product of its digits is 878080, while the sum is 50.

The square root of 1874785721 is about 43298.7958377597. The cubic root of 1874785721 is about 1233.0590613795.

The spelling of 1874785721 in words is "one billion, eight hundred seventy-four million, seven hundred eighty-five thousand, seven hundred twenty-one".