1889738813 has 2 divisors, whose sum is σ = 1889738814. Its totient is φ = 1889738812.

The previous prime is 1889738801. The next prime is 1889738843. The reversal of 1889738813 is 3188379881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1857782404 + 31956409 = 43102^2 + 5653^2 .

It is a cyclic number.

It is not a de Polignac number, because 1889738813 - 2¹⁶ = 1889673277 is a prime.

It is a super-2 number, since 2×1889738813² = 7142225562717297938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1889738843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944869406 + 944869407.

It is an arithmetic number, because the mean of its divisors is an integer number (944869407).

Almost surely, 2^1889738813 is an apocalyptic number.

It is an amenable number.

1889738813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889738813 is an equidigital number, since it uses as much as digits as its factorization.

1889738813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 56.

The square root of 1889738813 is about 43471.1261988921. The cubic root of 1889738813 is about 1236.3286335546.

The spelling of 1889738813 in words is "one billion, eight hundred eighty-nine million, seven hundred thirty-eight thousand, eight hundred thirteen".