1836687861 has 6 divisors (see below), whose sum is σ = 2652993590. Its totient is φ = 1224458568.

The previous prime is 1836687851. The next prime is 1836687883. The reversal of 1836687861 is 1687866381.

It can be written as a sum of positive squares in only one way, i.e., 1476864900 + 359822961 = 38430^2 + 18969^2 .

It is not a de Polignac number, because 1836687861 - 2²⁶ = 1769578997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1836687798 and 1836687807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1836687841) 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 5 ways as a sum of consecutive naturals, for example, 102038206 + ... + 102038223.

Almost surely, 2^1836687861 is an apocalyptic number.

It is an amenable number.

1836687861 is a deficient number, since it is larger than the sum of its proper divisors (816305729).

1836687861 is a wasteful number, since it uses less digits than its factorization.

1836687861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204076435 (or 204076432 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 1836687861 is about 42856.5964700885. The cubic root of 1836687861 is about 1224.6494314906.

The spelling of 1836687861 in words is "one billion, eight hundred thirty-six million, six hundred eighty-seven thousand, eight hundred sixty-one".