1899696797 has 2 divisors, whose sum is σ = 1899696798. Its totient is φ = 1899696796.

The previous prime is 1899696793. The next prime is 1899696857. The reversal of 1899696797 is 7976969981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1036453636 + 863243161 = 32194^2 + 29381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1899696797 - 2² = 1899696793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1899696797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1899696793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949848398 + 949848399.

It is an arithmetic number, because the mean of its divisors is an integer number (949848399).

Almost surely, 2^1899696797 is an apocalyptic number.

It is an amenable number.

1899696797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1899696797 is an equidigital number, since it uses as much as digits as its factorization.

1899696797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92588832, while the sum is 71.

The square root of 1899696797 is about 43585.5113197035. The cubic root of 1899696797 is about 1238.4964426491.

The spelling of 1899696797 in words is "one billion, eight hundred ninety-nine million, six hundred ninety-six thousand, seven hundred ninety-seven".