1391243 has 8 divisors (see below), whose sum is σ = 1598688. Its totient is φ = 1185984.

The previous prime is 1391239. The next prime is 1391261. The reversal of 1391243 is 3421931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1391243 - 2² = 1391239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1391233) 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 7 ways as a sum of consecutive naturals, for example, 1205 + ... + 2057.

It is an arithmetic number, because the mean of its divisors is an integer number (199836).

2^1391243 is an apocalyptic number.

1391243 is a deficient number, since it is larger than the sum of its proper divisors (207445).

1391243 is an equidigital number, since it uses as much as digits as its factorization.

1391243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093.

The product of its digits is 648, while the sum is 23.

The square root of 1391243 is about 1179.5096438775. The cubic root of 1391243 is about 111.6351595474.

The spelling of 1391243 in words is "one million, three hundred ninety-one thousand, two hundred forty-three".