1398839 has 4 divisors (see below), whose sum is σ = 1506456. Its totient is φ = 1291224.

The previous prime is 1398781. The next prime is 1398841. The reversal of 1398839 is 9388931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9388931 = 827 ⋅11353.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1398839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1398796 and 1398805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398139) 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 in 3 ways as a sum of consecutive naturals, for example, 53789 + ... + 53814.

It is an arithmetic number, because the mean of its divisors is an integer number (376614).

2^1398839 is an apocalyptic number.

1398839 is a deficient number, since it is larger than the sum of its proper divisors (107617).

1398839 is a wasteful number, since it uses less digits than its factorization.

1398839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107616.

The product of its digits is 46656, while the sum is 41.

The square root of 1398839 is about 1182.7252428185. The cubic root of 1398839 is about 111.8379618974.

The spelling of 1398839 in words is "one million, three hundred ninety-eight thousand, eight hundred thirty-nine".