1340446537 has 2 divisors, whose sum is σ = 1340446538. Its totient is φ = 1340446536.

The previous prime is 1340446517. The next prime is 1340446573. The reversal of 1340446537 is 7356440431.

Together with next prime (1340446573) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983198736 + 357247801 = 31356^2 + 18901^2 .

It is an emirp because it is prime and its reverse (7356440431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1340446537 - 2¹⁵ = 1340413769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340446496 and 1340446505.

It is not a weakly prime, because it can be changed into another prime (1340446507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670223268 + 670223269.

It is an arithmetic number, because the mean of its divisors is an integer number (670223269).

Almost surely, 2^1340446537 is an apocalyptic number.

It is an amenable number.

1340446537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340446537 is an equidigital number, since it uses as much as digits as its factorization.

1340446537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 37.

The square root of 1340446537 is about 36612.1091580368. The cubic root of 1340446537 is about 1102.5962193744.

Adding to 1340446537 its reverse (7356440431), we get a palindrome (8696886968).

The spelling of 1340446537 in words is "one billion, three hundred forty million, four hundred forty-six thousand, five hundred thirty-seven".