1279969 has 2 divisors, whose sum is σ = 1279970. Its totient is φ = 1279968.

The previous prime is 1279961. The next prime is 1279997. The reversal of 1279969 is 9699721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1166400 + 113569 = 1080^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279969 - 2³ = 1279961 is a prime.

It is a super-2 number, since 2×1279969² = 3276641281922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279961) 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, 639984 + 639985.

It is an arithmetic number, because the mean of its divisors is an integer number (639985).

2^1279969 is an apocalyptic number.

It is an amenable number.

1279969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279969 is an equidigital number, since it uses as much as digits as its factorization.

1279969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 43.

The square root of 1279969 is about 1131.3571496216. The cubic root of 1279969 is about 108.5758281260.

The spelling of 1279969 in words is "one million, two hundred seventy-nine thousand, nine hundred sixty-nine".