1289423 has 2 divisors, whose sum is σ = 1289424. Its totient is φ = 1289422.

The previous prime is 1289411. The next prime is 1289429. The reversal of 1289423 is 3249821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1289423 - 2¹⁴ = 1273039 is a prime.

It is a super-2 number, since 2×1289423² = 3325223345858, which contains 22 as substring.

It is a Sophie Germain prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1289429) 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, 644711 + 644712.

It is an arithmetic number, because the mean of its divisors is an integer number (644712).

2^1289423 is an apocalyptic number.

1289423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289423 is an equidigital number, since it uses as much as digits as its factorization.

1289423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 1289423 is about 1135.5276306634. The cubic root of 1289423 is about 108.8424905674.

The spelling of 1289423 in words is "one million, two hundred eighty-nine thousand, four hundred twenty-three".