1999868417 has 2 divisors, whose sum is σ = 1999868418. Its totient is φ = 1999868416.

The previous prime is 1999868407. The next prime is 1999868441. The reversal of 1999868417 is 7148689991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1878008896 + 121859521 = 43336^2 + 11039^2 .

It is an emirp because it is prime and its reverse (7148689991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1999868417 - 2¹⁴ = 1999852033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1999868417.

It is not a weakly prime, because it can be changed into another prime (1999868407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999934208 + 999934209.

It is an arithmetic number, because the mean of its divisors is an integer number (999934209).

Almost surely, 2^1999868417 is an apocalyptic number.

It is an amenable number.

1999868417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999868417 is an equidigital number, since it uses as much as digits as its factorization.

1999868417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 62.

The square root of 1999868417 is about 44719.8883831344. Note that the first 3 decimals coincide. The cubic root of 1999868417 is about 1259.8934185903.

The spelling of 1999868417 in words is "one billion, nine hundred ninety-nine million, eight hundred sixty-eight thousand, four hundred seventeen".