1398161 has 2 divisors, whose sum is σ = 1398162. Its totient is φ = 1398160.

The previous prime is 1398151. The next prime is 1398197. The reversal of 1398161 is 1618931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 398161 = 1000^2 + 631^2 .

It is an emirp because it is prime and its reverse (1618931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1398161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1398121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699080 + 699081.

It is an arithmetic number, because the mean of its divisors is an integer number (699081).

2^1398161 is an apocalyptic number.

It is an amenable number.

1398161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398161 is an equidigital number, since it uses as much as digits as its factorization.

1398161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 29.

The square root of 1398161 is about 1182.4385819145. The cubic root of 1398161 is about 111.8198901507.

The spelling of 1398161 in words is "one million, three hundred ninety-eight thousand, one hundred sixty-one".