1269643 has 2 divisors, whose sum is σ = 1269644. Its totient is φ = 1269642.

The previous prime is 1269641. The next prime is 1269683. The reversal of 1269643 is 3469621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1269643 - 2¹ = 1269641 is a prime.

It is a super-2 number, since 2×1269643² = 3223986694898, which contains 22 as substring.

Together with 1269641, it forms a pair of twin primes.

1269643 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1269641) 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 as a sum of consecutive naturals, namely, 634821 + 634822.

It is an arithmetic number, because the mean of its divisors is an integer number (634822).

2^1269643 is an apocalyptic number.

1269643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1269643 is an equidigital number, since it uses as much as digits as its factorization.

1269643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 1269643 is about 1126.7843626888. The cubic root of 1269643 is about 108.2830651729.

The spelling of 1269643 in words is "one million, two hundred sixty-nine thousand, six hundred forty-three".