1391206 has 4 divisors (see below), whose sum is σ = 2086812. Its totient is φ = 695602.

The previous prime is 1391189. The next prime is 1391207. The reversal of 1391206 is 6021931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6021931 = 379 ⋅15889.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391207) 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 as a sum of consecutive naturals, namely, 347800 + ... + 347803.

It is an arithmetic number, because the mean of its divisors is an integer number (521703).

2^1391206 is an apocalyptic number.

1391206 is a deficient number, since it is larger than the sum of its proper divisors (695606).

1391206 is an equidigital number, since it uses as much as digits as its factorization.

1391206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695605.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1391206 is about 1179.4939592893. The cubic root of 1391206 is about 111.6341698958.

It can be divided in two parts, 13 and 91206, that added together give a palindrome (91219).

The spelling of 1391206 in words is "one million, three hundred ninety-one thousand, two hundred six".