1391347 has 4 divisors (see below), whose sum is σ = 1399216. Its totient is φ = 1383480.

The previous prime is 1391323. The next prime is 1391353. The reversal of 1391347 is 7431931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1391347 - 2¹⁹ = 867059 is a prime.

It is a Duffinian number.

1391347 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1391317) 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 in 3 ways as a sum of consecutive naturals, for example, 3663 + ... + 4024.

It is an arithmetic number, because the mean of its divisors is an integer number (349804).

2^1391347 is an apocalyptic number.

1391347 is a deficient number, since it is larger than the sum of its proper divisors (7869).

1391347 is an equidigital number, since it uses as much as digits as its factorization.

1391347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7868.

The product of its digits is 2268, while the sum is 28.

The square root of 1391347 is about 1179.5537291705. The cubic root of 1391347 is about 111.6379411768.

Adding to 1391347 its product of digits (2268), we get a triangular number (1393615 = T₁₆₆₉).

The spelling of 1391347 in words is "one million, three hundred ninety-one thousand, three hundred forty-seven".