1398217 has 2 divisors, whose sum is σ = 1398218. Its totient is φ = 1398216.

The previous prime is 1398211. The next prime is 1398227. The reversal of 1398217 is 7128931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 207936 = 1091^2 + 456^2 .

It is an emirp because it is prime and its reverse (7128931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1398217 - 2³ = 1398209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1398211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699108 + 699109.

It is an arithmetic number, because the mean of its divisors is an integer number (699109).

2^1398217 is an apocalyptic number.

It is an amenable number.

1398217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398217 is an equidigital number, since it uses as much as digits as its factorization.

1398217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1398217 is about 1182.4622615543. The cubic root of 1398217 is about 111.8213830237.

The spelling of 1398217 in words is "one million, three hundred ninety-eight thousand, two hundred seventeen".