18839893861 has 2 divisors, whose sum is σ = 18839893862. Its totient is φ = 18839893860.

The previous prime is 18839893843. The next prime is 18839893871. The reversal of 18839893861 is 16839893881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13017440836 + 5822453025 = 114094^2 + 76305^2 .

It is a cyclic number.

It is not a de Polignac number, because 18839893861 - 2⁹ = 18839893349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18839893793 and 18839893802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18839893871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9419946930 + 9419946931.

It is an arithmetic number, because the mean of its divisors is an integer number (9419946931).

Almost surely, 2^18839893861 is an apocalyptic number.

It is an amenable number.

18839893861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18839893861 is an equidigital number, since it uses as much as digits as its factorization.

18839893861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17915904, while the sum is 64.

The spelling of 18839893861 in words is "eighteen billion, eight hundred thirty-nine million, eight hundred ninety-three thousand, eight hundred sixty-one".