1289669 has 6 divisors (see below), whose sum is σ = 1314066. Its totient is φ = 1265600.

The previous prime is 1289657. The next prime is 1289677. The reversal of 1289669 is 9669821.

It can be written as a sum of positive squares in 3 ways, for example, as 1444 + 1288225 = 38^2 + 1135^2 .

It is not a de Polignac number, because 1289669 - 2⁴ = 1289653 is a prime.

It is a super-2 number, since 2×1289669² = 3326492259122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11357 + ... + 11469.

It is an arithmetic number, because the mean of its divisors is an integer number (219011).

2^1289669 is an apocalyptic number.

It is an amenable number.

1289669 is a deficient number, since it is larger than the sum of its proper divisors (24397).

1289669 is an equidigital number, since it uses as much as digits as its factorization.

1289669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 214 counting only the distinct ones).

The product of its digits is 46656, while the sum is 41.

The square root of 1289669 is about 1135.6359451867. The cubic root of 1289669 is about 108.8494118932.

The spelling of 1289669 in words is "one million, two hundred eighty-nine thousand, six hundred sixty-nine".