1843797861 has 6 divisors (see below), whose sum is σ = 2663263590. Its totient is φ = 1229198568.

The previous prime is 1843797847. The next prime is 1843797863. The reversal of 1843797861 is 1687973481.

It can be written as a sum of positive squares in only one way, i.e., 1840924836 + 2873025 = 42906^2 + 1695^2 .

It is not a de Polignac number, because 1843797861 - 2⁶ = 1843797797 is a prime.

It is a super-4 number, since 4×1843797861⁴ (a number of 38 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1843797798 and 1843797807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1843797863) 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, 102433206 + ... + 102433223.

It is an arithmetic number, because the mean of its divisors is an integer number (443877265).

Almost surely, 2^1843797861 is an apocalyptic number.

It is an amenable number.

1843797861 is a deficient number, since it is larger than the sum of its proper divisors (819465729).

1843797861 is a wasteful number, since it uses less digits than its factorization.

1843797861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204866435 (or 204866432 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 1843797861 is about 42939.4674047082. The cubic root of 1843797861 is about 1226.2276430443.

The spelling of 1843797861 in words is "one billion, eight hundred forty-three million, seven hundred ninety-seven thousand, eight hundred sixty-one".