1340291 has 2 divisors, whose sum is σ = 1340292. Its totient is φ = 1340290.

The previous prime is 1340281. The next prime is 1340321. The reversal of 1340291 is 1920431.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340291 is a prime.

It is a Sophie Germain prime.

It is equal to p₁₀₂₈₇₂ and since 1340291 and 102872 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1340221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670145 + 670146.

It is an arithmetic number, because the mean of its divisors is an integer number (670146).

2^1340291 is an apocalyptic number.

1340291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340291 is an equidigital number, since it uses as much as digits as its factorization.

1340291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1340291 is about 1157.7093763117. The cubic root of 1340291 is about 110.2553571611.

It can be divided in two parts, 13 and 40291, that added together give a palindrome (40304).

The spelling of 1340291 in words is "one million, three hundred forty thousand, two hundred ninety-one".