1391927 has 2 divisors, whose sum is σ = 1391928. Its totient is φ = 1391926.

The previous prime is 1391917. The next prime is 1391933. The reversal of 1391927 is 7291931.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7291931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1391927 - 2¹⁰ = 1390903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1391893 and 1391902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391917) by changing a digit.

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 as a sum of consecutive naturals, namely, 695963 + 695964.

It is an arithmetic number, because the mean of its divisors is an integer number (695964).

2^1391927 is an apocalyptic number.

1391927 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391927 is an equidigital number, since it uses as much as digits as its factorization.

1391927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 32.

The square root of 1391927 is about 1179.7995592472. The cubic root of 1391927 is about 111.6534515685.

The spelling of 1391927 in words is "one million, three hundred ninety-one thousand, nine hundred twenty-seven".