1391825 has 6 divisors (see below), whose sum is σ = 1725894. Its totient is φ = 1113440.

The previous prime is 1391779. The next prime is 1391849. The reversal of 1391825 is 5281931.

It can be written as a sum of positive squares in 3 ways, for example, as 274576 + 1117249 = 524^2 + 1057^2 .

It is not a de Polignac number, because 1391825 - 2¹⁰ = 1390801 is a prime.

It is a Duffinian 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 in 5 ways as a sum of consecutive naturals, for example, 27812 + ... + 27861.

It is an arithmetic number, because the mean of its divisors is an integer number (287649).

2^1391825 is an apocalyptic number.

It is an amenable number.

1391825 is a deficient number, since it is larger than the sum of its proper divisors (334069).

1391825 is an equidigital number, since it uses as much as digits as its factorization.

1391825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55683 (or 55678 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 1391825 is about 1179.7563307734. The cubic root of 1391825 is about 111.6507241912.

The spelling of 1391825 in words is "one million, three hundred ninety-one thousand, eight hundred twenty-five".