1340723437 has 2 divisors, whose sum is σ = 1340723438. Its totient is φ = 1340723436.

The previous prime is 1340723401. The next prime is 1340723443. The reversal of 1340723437 is 7343270431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1339999236 + 724201 = 36606^2 + 851^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340723437 - 2¹⁹ = 1340199149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340723477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670361718 + 670361719.

It is an arithmetic number, because the mean of its divisors is an integer number (670361719).

Almost surely, 2^1340723437 is an apocalyptic number.

It is an amenable number.

1340723437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340723437 is an equidigital number, since it uses as much as digits as its factorization.

1340723437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 34.

The square root of 1340723437 is about 36615.8904985254. The cubic root of 1340723437 is about 1102.6721363329.

Adding to 1340723437 its reverse (7343270431), we get a palindrome (8683993868).

The spelling of 1340723437 in words is "one billion, three hundred forty million, seven hundred twenty-three thousand, four hundred thirty-seven".