1872868709 has 2 divisors, whose sum is σ = 1872868710. Its totient is φ = 1872868708.

The previous prime is 1872868687. The next prime is 1872868727. The reversal of 1872868709 is 9078682781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1391066209 + 481802500 = 37297^2 + 21950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1872868709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1872868729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936434354 + 936434355.

It is an arithmetic number, because the mean of its divisors is an integer number (936434355).

Almost surely, 2^1872868709 is an apocalyptic number.

It is an amenable number.

1872868709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872868709 is an equidigital number, since it uses as much as digits as its factorization.

1872868709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2709504, while the sum is 56.

The square root of 1872868709 is about 43276.6531631086. The cubic root of 1872868709 is about 1232.6386408615.

The spelling of 1872868709 in words is "one billion, eight hundred seventy-two million, eight hundred sixty-eight thousand, seven hundred nine".