1340404237 has 2 divisors, whose sum is σ = 1340404238. Its totient is φ = 1340404236.

The previous prime is 1340404207. The next prime is 1340404259. The reversal of 1340404237 is 7324040431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1317036681 + 23367556 = 36291^2 + 4834^2 .

It is an emirp because it is prime and its reverse (7324040431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340404237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340404207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670202118 + 670202119.

It is an arithmetic number, because the mean of its divisors is an integer number (670202119).

Almost surely, 2^1340404237 is an apocalyptic number.

It is an amenable number.

1340404237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340404237 is an equidigital number, since it uses as much as digits as its factorization.

1340404237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 1340404237 is about 36611.5314757523. The cubic root of 1340404237 is about 1102.5846211720.

Adding to 1340404237 its reverse (7324040431), we get a palindrome (8664444668).

The spelling of 1340404237 in words is "one billion, three hundred forty million, four hundred four thousand, two hundred thirty-seven".