1391828 has 6 divisors (see below), whose sum is σ = 2435706. Its totient is φ = 695912.

The previous prime is 1391779. The next prime is 1391849. The reversal of 1391828 is 8281931.

It can be written as a sum of positive squares in only one way, i.e., 770884 + 620944 = 878^2 + 788^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1391794 and 1391803.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 173975 + ... + 173982.

It is an arithmetic number, because the mean of its divisors is an integer number (405951).

2^1391828 is an apocalyptic number.

It is an amenable number.

1391828 is a deficient number, since it is larger than the sum of its proper divisors (1043878).

1391828 is a wasteful number, since it uses less digits than its factorization.

1391828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347961 (or 347959 counting only the distinct ones).

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

The square root of 1391828 is about 1179.7576022217. The cubic root of 1391828 is about 111.6508044101.

The spelling of 1391828 in words is "one million, three hundred ninety-one thousand, eight hundred twenty-eight".