1243969 has 2 divisors, whose sum is σ = 1243970. Its totient is φ = 1243968.

The previous prime is 1243967. The next prime is 1243997. The reversal of 1243969 is 9693421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1199025 + 44944 = 1095^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243969 - 2¹ = 1243967 is a prime.

It is a super-2 number, since 2×1243969² = 3094917745922, which contains 22 as substring.

Together with 1243967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1243961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621984 + 621985.

It is an arithmetic number, because the mean of its divisors is an integer number (621985).

2^1243969 is an apocalyptic number.

It is an amenable number.

1243969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243969 is an equidigital number, since it uses as much as digits as its factorization.

1243969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 1243969 is about 1115.3335823869. Note that the first 3 decimals coincide. The cubic root of 1243969 is about 107.5482098529.

The spelling of 1243969 in words is "one million, two hundred forty-three thousand, nine hundred sixty-nine".