1855538873 has 2 divisors, whose sum is σ = 1855538874. Its totient is φ = 1855538872.

The previous prime is 1855538857. The next prime is 1855538911. The reversal of 1855538873 is 3788355581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1761313024 + 94225849 = 41968^2 + 9707^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855538873 - 2⁴ = 1855538857 is a prime.

It is a super-2 number, since 2×1855538873² = 6886049018428220258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1855538843) 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, 927769436 + 927769437.

It is an arithmetic number, because the mean of its divisors is an integer number (927769437).

Almost surely, 2^1855538873 is an apocalyptic number.

It is an amenable number.

1855538873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855538873 is an equidigital number, since it uses as much as digits as its factorization.

1855538873 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 1855538873 is about 43075.9663037290. The cubic root of 1855538873 is about 1228.8249453902.

It can be divided in two parts, 185553887 and 3, that multiplied together give a triangular number (556661661 = T₃₃₃₆₆).

The spelling of 1855538873 in words is "one billion, eight hundred fifty-five million, five hundred thirty-eight thousand, eight hundred seventy-three".