1199939857 has 2 divisors, whose sum is σ = 1199939858. Its totient is φ = 1199939856.

The previous prime is 1199939843. The next prime is 1199939861. The reversal of 1199939857 is 7589399911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1163082816 + 36857041 = 34104^2 + 6071^2 .

It is an emirp because it is prime and its reverse (7589399911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1199939857 - 2¹⁵ = 1199907089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1199939795 and 1199939804.

It is not a weakly prime, because it can be changed into another prime (1199939057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599969928 + 599969929.

It is an arithmetic number, because the mean of its divisors is an integer number (599969929).

Almost surely, 2^1199939857 is an apocalyptic number.

It is an amenable number.

1199939857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1199939857 is an equidigital number, since it uses as much as digits as its factorization.

1199939857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5511240, while the sum is 61.

The square root of 1199939857 is about 34640.1480510693. The cubic root of 1199939857 is about 1062.6408156987.

The spelling of 1199939857 in words is "one billion, one hundred ninety-nine million, nine hundred thirty-nine thousand, eight hundred fifty-seven".