1906968857 has 4 divisors (see below), whose sum is σ = 1907076276. Its totient is φ = 1906861440.

The previous prime is 1906968823. The next prime is 1906968887. The reversal of 1906968857 is 7588696091.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 143304841 + 1763664016 = 11971^2 + 41996^2 .

It is a cyclic number.

It is not a de Polignac number, because 1906968857 - 2¹⁰ = 1906967833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1906968796 and 1906968805.

It is not an unprimeable number, because it can be changed into a prime (1906968887) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 20048 + ... + 64929.

It is an arithmetic number, because the mean of its divisors is an integer number (476769069).

Almost surely, 2^1906968857 is an apocalyptic number.

It is an amenable number.

1906968857 is a deficient number, since it is larger than the sum of its proper divisors (107419).

1906968857 is an equidigital number, since it uses as much as digits as its factorization.

1906968857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107418.

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 1906968857 is about 43668.8545418814. The cubic root of 1906968857 is about 1240.0747563758.

The spelling of 1906968857 in words is "one billion, nine hundred six million, nine hundred sixty-eight thousand, eight hundred fifty-seven".