1200643 has 2 divisors, whose sum is σ = 1200644. Its totient is φ = 1200642.

The previous prime is 1200637. The next prime is 1200673. The reversal of 1200643 is 3460021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200643 - 2⁵ = 1200611 is a prime.

It is a super-2 number, since 2×1200643² = 2883087226898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1200673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600321 + 600322.

It is an arithmetic number, because the mean of its divisors is an integer number (600322).

2^1200643 is an apocalyptic number.

1200643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200643 is an equidigital number, since it uses as much as digits as its factorization.

1200643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1200643 is about 1095.7385637094. The cubic root of 1200643 is about 106.2848337920.

Adding to 1200643 its reverse (3460021), we get a palindrome (4660664).

The spelling of 1200643 in words is "one million, two hundred thousand, six hundred forty-three".