1276643 has 4 divisors (see below), whose sum is σ = 1279608. Its totient is φ = 1273680.

The previous prime is 1276637. The next prime is 1276657. The reversal of 1276643 is 3466721.

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 1276643 - 2⁶ = 1276579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1276603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698 + ... + 1743.

It is an arithmetic number, because the mean of its divisors is an integer number (319902).

2^1276643 is an apocalyptic number.

1276643 is a deficient number, since it is larger than the sum of its proper divisors (2965).

1276643 is an equidigital number, since it uses as much as digits as its factorization.

1276643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964.

The product of its digits is 6048, while the sum is 29.

The square root of 1276643 is about 1129.8862774634. The cubic root of 1276643 is about 108.4817017710.

The spelling of 1276643 in words is "one million, two hundred seventy-six thousand, six hundred forty-three".