1327691 has 4 divisors (see below), whose sum is σ = 1330032. Its totient is φ = 1325352.

The previous prime is 1327679. The next prime is 1327709. The reversal of 1327691 is 1967231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1967231 = 7 ⋅281033.

It is a cyclic number.

It is not a de Polignac number, because 1327691 - 2¹⁴ = 1311307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1327631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281 + ... + 1653.

It is an arithmetic number, because the mean of its divisors is an integer number (332508).

2^1327691 is an apocalyptic number.

1327691 is a deficient number, since it is larger than the sum of its proper divisors (2341).

1327691 is an equidigital number, since it uses as much as digits as its factorization.

1327691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340.

The product of its digits is 2268, while the sum is 29.

The square root of 1327691 is about 1152.2547461391. The cubic root of 1327691 is about 109.9087673289.

The spelling of 1327691 in words is "one million, three hundred twenty-seven thousand, six hundred ninety-one".