1340891 has 2 divisors, whose sum is σ = 1340892. Its totient is φ = 1340890.

The previous prime is 1340879. The next prime is 1340897. The reversal of 1340891 is 1980431.

It is a strong prime.

It is an emirp because it is prime and its reverse (1980431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1340891 - 2⁶ = 1340827 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1340891.

It is not a weakly prime, because it can be changed into another prime (1340897) 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, 670445 + 670446.

It is an arithmetic number, because the mean of its divisors is an integer number (670446).

2^1340891 is an apocalyptic number.

1340891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340891 is an equidigital number, since it uses as much as digits as its factorization.

1340891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1340891 is about 1157.9684797092. The cubic root of 1340891 is about 110.2718071572.

It can be divided in two parts, 13 and 40891, that added together give a palindrome (40904).

The spelling of 1340891 in words is "one million, three hundred forty thousand, eight hundred ninety-one".