1398391 has 4 divisors (see below), whose sum is σ = 1428192. Its totient is φ = 1368592.

The previous prime is 1398367. The next prime is 1398401. The reversal of 1398391 is 1938931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1398391 - 2⁷ = 1398263 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398091) 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 in 3 ways as a sum of consecutive naturals, for example, 14830 + ... + 14923.

It is an arithmetic number, because the mean of its divisors is an integer number (357048).

2^1398391 is an apocalyptic number.

1398391 is a deficient number, since it is larger than the sum of its proper divisors (29801).

1398391 is an equidigital number, since it uses as much as digits as its factorization.

1398391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29800.

The product of its digits is 5832, while the sum is 34.

The square root of 1398391 is about 1182.5358345522. The cubic root of 1398391 is about 111.8260213389.

The spelling of 1398391 in words is "one million, three hundred ninety-eight thousand, three hundred ninety-one".