1899696857 has 2 divisors, whose sum is σ = 1899696858. Its totient is φ = 1899696856.

The previous prime is 1899696797. The next prime is 1899696859. The reversal of 1899696857 is 7586969981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000836496 + 898860361 = 31636^2 + 29981^2 .

It is a cyclic number.

It is not a de Polignac number, because 1899696857 - 2⁶ = 1899696793 is a prime.

Together with 1899696859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1899696859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949848428 + 949848429.

It is an arithmetic number, because the mean of its divisors is an integer number (949848429).

Almost surely, 2^1899696857 is an apocalyptic number.

It is an amenable number.

1899696857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1899696857 is an equidigital number, since it uses as much as digits as its factorization.

1899696857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58786560, while the sum is 68.

The square root of 1899696857 is about 43585.5120080056. The cubic root of 1899696857 is about 1238.4964556880.

The spelling of 1899696857 in words is "one billion, eight hundred ninety-nine million, six hundred ninety-six thousand, eight hundred fifty-seven".