1939198873 has 2 divisors, whose sum is σ = 1939198874. Its totient is φ = 1939198872.

The previous prime is 1939198847. The next prime is 1939198901. The reversal of 1939198873 is 3788919391.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1880783424 + 58415449 = 43368^2 + 7643^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1939198873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1939198813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969599436 + 969599437.

It is an arithmetic number, because the mean of its divisors is an integer number (969599437).

Almost surely, 2^1939198873 is an apocalyptic number.

It is an amenable number.

1939198873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1939198873 is an equidigital number, since it uses as much as digits as its factorization.

1939198873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 58.

The square root of 1939198873 is about 44036.3358262242. The cubic root of 1939198873 is about 1247.0220037716.

The spelling of 1939198873 in words is "one billion, nine hundred thirty-nine million, one hundred ninety-eight thousand, eight hundred seventy-three".