1999297 has 2 divisors, whose sum is σ = 1999298. Its totient is φ = 1999296.

The previous prime is 1999273. The next prime is 1999301. The reversal of 1999297 is 7929991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1308736 + 690561 = 1144^2 + 831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1999247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999648 + 999649.

It is an arithmetic number, because the mean of its divisors is an integer number (999649).

2^1999297 is an apocalyptic number.

It is an amenable number.

1999297 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999297 is an equidigital number, since it uses as much as digits as its factorization.

1999297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 46.

The square root of 1999297 is about 1413.9649924945. The cubic root of 1999297 is about 125.9773411846.

The spelling of 1999297 in words is "one million, nine hundred ninety-nine thousand, two hundred ninety-seven".