1206043643 has 4 divisors (see below), whose sum is σ = 1378335600. Its totient is φ = 1033751688.

The previous prime is 1206043613. The next prime is 1206043711. The reversal of 1206043643 is 3463406021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1206043643 - 2¹⁰ = 1206042619 is a prime.

It is a super-2 number, since 2×1206043643² = 2909082537641422898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1206043613) 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 in 3 ways as a sum of consecutive naturals, for example, 86145968 + ... + 86145981.

It is an arithmetic number, because the mean of its divisors is an integer number (344583900).

Almost surely, 2^1206043643 is an apocalyptic number.

1206043643 is a deficient number, since it is larger than the sum of its proper divisors (172291957).

1206043643 is an equidigital number, since it uses as much as digits as its factorization.

1206043643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172291956.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 1206043643 is about 34728.1390661809. The cubic root of 1206043643 is about 1064.4395628907.

Adding to 1206043643 its reverse (3463406021), we get a palindrome (4669449664).

The spelling of 1206043643 in words is "one billion, two hundred six million, forty-three thousand, six hundred forty-three".