1289312 has 24 divisors (see below), whose sum is σ = 2600136. Its totient is φ = 628992.

The previous prime is 1289303. The next prime is 1289329. The reversal of 1289312 is 2139821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908 + ... + 1844.

It is an arithmetic number, because the mean of its divisors is an integer number (108339).

2^1289312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1289312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1300068).

1289312 is an abundant number, since it is smaller than the sum of its proper divisors (1310824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1289312 is an equidigital number, since it uses as much as digits as its factorization.

1289312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 982 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 1289312 is about 1135.4787536542. The cubic root of 1289312 is about 108.8393672419.

The spelling of 1289312 in words is "one million, two hundred eighty-nine thousand, three hundred twelve".