1268623 has 2 divisors, whose sum is σ = 1268624. Its totient is φ = 1268622.

The previous prime is 1268621. The next prime is 1268627. The reversal of 1268623 is 3268621.

It is a weak prime.

It is an emirp because it is prime and its reverse (3268621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1268623 - 2¹ = 1268621 is a prime.

It is a super-2 number, since 2×1268623² = 3218808632258, which contains 22 as substring.

Together with 1268621, it forms a pair of twin primes.

It is equal to p₉₇₈₀₄ and since 1268623 and 97804 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 1268591 and 1268600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268621) 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, 634311 + 634312.

It is an arithmetic number, because the mean of its divisors is an integer number (634312).

2^1268623 is an apocalyptic number.

1268623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268623 is an equidigital number, since it uses as much as digits as its factorization.

1268623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 1268623 is about 1126.3316563073. The cubic root of 1268623 is about 108.2540600859.

It can be divided in two parts, 1268 and 623, that added together give a triangular number (1891 = T₆₁).

The spelling of 1268623 in words is "one million, two hundred sixty-eight thousand, six hundred twenty-three".