1868507849 has 4 divisors (see below), whose sum is σ = 2012239236. Its totient is φ = 1724776464.

The previous prime is 1868507843. The next prime is 1868507863. The reversal of 1868507849 is 9487058681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 447745600 + 1420762249 = 21160^2 + 37693^2 .

It is a cyclic number.

It is not a de Polignac number, because 1868507849 - 2¹⁶ = 1868442313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1868507794 and 1868507803.

It is not an unprimeable number, because it can be changed into a prime (1868507843) 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 3 ways as a sum of consecutive naturals, for example, 71865674 + ... + 71865699.

It is an arithmetic number, because the mean of its divisors is an integer number (503059809).

Almost surely, 2^1868507849 is an apocalyptic number.

It is an amenable number.

1868507849 is a deficient number, since it is larger than the sum of its proper divisors (143731387).

1868507849 is a wasteful number, since it uses less digits than its factorization.

1868507849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143731386.

The product of its (nonzero) digits is 3870720, while the sum is 56.

The square root of 1868507849 is about 43226.2402829578. The cubic root of 1868507849 is about 1231.6811895122.

The spelling of 1868507849 in words is "one billion, eight hundred sixty-eight million, five hundred seven thousand, eight hundred forty-nine".