1872886721 has 8 divisors (see below), whose sum is σ = 1907747688. Its totient is φ = 1838160000.

The previous prime is 1872886699. The next prime is 1872886727. The reversal of 1872886721 is 1276882781.

It can be written as a sum of positive squares in 4 ways, for example, as 45751696 + 1827135025 = 6764^2 + 42745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1872886721 - 2⁶ = 1872886657 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 1872886721.

It is not an unprimeable number, because it can be changed into a prime (1872886727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5180 + ... + 61421.

It is an arithmetic number, because the mean of its divisors is an integer number (238468461).

Almost surely, 2^1872886721 is an apocalyptic number.

It is an amenable number.

1872886721 is a deficient number, since it is larger than the sum of its proper divisors (34860967).

1872886721 is an equidigital number, since it uses as much as digits as its factorization.

1872886721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67123.

The product of its digits is 602112, while the sum is 50.

The square root of 1872886721 is about 43276.8612655770. The cubic root of 1872886721 is about 1232.6425924138.

The spelling of 1872886721 in words is "one billion, eight hundred seventy-two million, eight hundred eighty-six thousand, seven hundred twenty-one".