1356643 has 2 divisors, whose sum is σ = 1356644. Its totient is φ = 1356642.

The previous prime is 1356629. The next prime is 1356647. The reversal of 1356643 is 3466531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1356643 - 2⁵ = 1356611 is a prime.

It is not a weakly prime, because it can be changed into another prime (1356647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678321 + 678322.

It is an arithmetic number, because the mean of its divisors is an integer number (678322).

2^1356643 is an apocalyptic number.

1356643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356643 is an equidigital number, since it uses as much as digits as its factorization.

1356643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 28.

The square root of 1356643 is about 1164.7501878085. The cubic root of 1356643 is about 110.7019300616.

The spelling of 1356643 in words is "one million, three hundred fifty-six thousand, six hundred forty-three".