1855338857 has 2 divisors, whose sum is σ = 1855338858. Its totient is φ = 1855338856.

The previous prime is 1855338833. The next prime is 1855338883. The reversal of 1855338857 is 7588335581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1791913561 + 63425296 = 42331^2 + 7964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1855338857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1855338799 and 1855338808.

It is not a weakly prime, because it can be changed into another prime (1855338257) by changing a digit.

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 as a sum of consecutive naturals, namely, 927669428 + 927669429.

It is an arithmetic number, because the mean of its divisors is an integer number (927669429).

Almost surely, 2^1855338857 is an apocalyptic number.

It is an amenable number.

1855338857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855338857 is an equidigital number, since it uses as much as digits as its factorization.

1855338857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032000, while the sum is 53.

The square root of 1855338857 is about 43073.6445753085. The cubic root of 1855338857 is about 1228.7807904755.

The spelling of 1855338857 in words is "one billion, eight hundred fifty-five million, three hundred thirty-eight thousand, eight hundred fifty-seven".