1798997 has 2 divisors, whose sum is σ = 1798998. Its totient is φ = 1798996.

The previous prime is 1798987. The next prime is 1798999. The reversal of 1798997 is 7998971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1168561 + 630436 = 1081^2 + 794^2 .

It is an emirp because it is prime and its reverse (7998971) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1798997 is a prime.

Together with 1798999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1798999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899498 + 899499.

It is an arithmetic number, because the mean of its divisors is an integer number (899499).

2^1798997 is an apocalyptic number.

It is an amenable number.

1798997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798997 is an equidigital number, since it uses as much as digits as its factorization.

1798997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 50.

The square root of 1798997 is about 1341.2669383833. The cubic root of 1798997 is about 121.6214414594.

The spelling of 1798997 in words is "one million, seven hundred ninety-eight thousand, nine hundred ninety-seven".