1398281 has 2 divisors, whose sum is σ = 1398282. Its totient is φ = 1398280.

The previous prime is 1398269. The next prime is 1398283. The reversal of 1398281 is 1828931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1032256 + 366025 = 1016^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398281 - 2⁶ = 1398217 is a prime.

It is a super-2 number, since 2×1398281² = 3910379509922, which contains 22 as substring.

Together with 1398283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1398283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699140 + 699141.

It is an arithmetic number, because the mean of its divisors is an integer number (699141).

2^1398281 is an apocalyptic number.

It is an amenable number.

1398281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398281 is an equidigital number, since it uses as much as digits as its factorization.

1398281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 1398281 is about 1182.4893234190. The cubic root of 1398281 is about 111.8230891154.

The spelling of 1398281 in words is "one million, three hundred ninety-eight thousand, two hundred eighty-one".