1391838 has 32 divisors (see below), whose sum is σ = 3287040. Its totient is φ = 384480.

The previous prime is 1391779. The next prime is 1391849. The reversal of 1391838 is 8381931.

It is a junction number, because it is equal to n+sod(n) for n = 1391799 and 1391808.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 768 + ... + 1836.

It is an arithmetic number, because the mean of its divisors is an integer number (102720).

2^1391838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1643520).

1391838 is an abundant number, since it is smaller than the sum of its proper divisors (1895202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391838 is a wasteful number, since it uses less digits than its factorization.

1391838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112.

The product of its digits is 5184, while the sum is 33.

The square root of 1391838 is about 1179.7618403729. The cubic root of 1391838 is about 111.6510718055.

The spelling of 1391838 in words is "one million, three hundred ninety-one thousand, eight hundred thirty-eight".