1868481893 has 2 divisors, whose sum is σ = 1868481894. Its totient is φ = 1868481892.

The previous prime is 1868481887. The next prime is 1868481949. The reversal of 1868481893 is 3981848681.

It is an a-pointer prime, because the next prime (1868481949) can be obtained adding 1868481893 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1571884609 + 296597284 = 39647^2 + 17222^2 .

It is a cyclic number.

It is not a de Polignac number, because 1868481893 - 2¹⁰ = 1868480869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868481493) 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 as a sum of consecutive naturals, namely, 934240946 + 934240947.

It is an arithmetic number, because the mean of its divisors is an integer number (934240947).

Almost surely, 2^1868481893 is an apocalyptic number.

It is an amenable number.

1868481893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868481893 is an equidigital number, since it uses as much as digits as its factorization.

1868481893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 56.

The square root of 1868481893 is about 43225.9400476149. The cubic root of 1868481893 is about 1231.6754862688.

The spelling of 1868481893 in words is "one billion, eight hundred sixty-eight million, four hundred eighty-one thousand, eight hundred ninety-three".