1865980849 has 2 divisors, whose sum is σ = 1865980850. Its totient is φ = 1865980848.

The previous prime is 1865980847. The next prime is 1865980867. The reversal of 1865980849 is 9480895681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1291899249 + 574081600 = 35943^2 + 23960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865980849 - 2¹ = 1865980847 is a prime.

Together with 1865980847, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1865980793 and 1865980802.

It is not a weakly prime, because it can be changed into another prime (1865980847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932990424 + 932990425.

It is an arithmetic number, because the mean of its divisors is an integer number (932990425).

Almost surely, 2^1865980849 is an apocalyptic number.

It is an amenable number.

1865980849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865980849 is an equidigital number, since it uses as much as digits as its factorization.

1865980849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 58.

The square root of 1865980849 is about 43197.0004629951. Note that the first 3 decimals coincide. The cubic root of 1865980849 is about 1231.1256905463.

The spelling of 1865980849 in words is "one billion, eight hundred sixty-five million, nine hundred eighty thousand, eight hundred forty-nine".