1340446643 has 2 divisors, whose sum is σ = 1340446644. Its totient is φ = 1340446642.

The previous prime is 1340446633. The next prime is 1340446703. The reversal of 1340446643 is 3466440431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1340446643 - 2¹² = 1340442547 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1340446633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670223321 + 670223322.

It is an arithmetic number, because the mean of its divisors is an integer number (670223322).

Almost surely, 2^1340446643 is an apocalyptic number.

1340446643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340446643 is an equidigital number, since it uses as much as digits as its factorization.

1340446643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 1340446643 is about 36612.1106056452. The cubic root of 1340446643 is about 1102.5962484381.

The spelling of 1340446643 in words is "one billion, three hundred forty million, four hundred forty-six thousand, six hundred forty-three".