1289320 has 16 divisors (see below), whose sum is σ = 2901060. Its totient is φ = 515712.

The previous prime is 1289303. The next prime is 1289329. The reversal of 1289320 is 239821.

It can be written as a sum of positive squares in 2 ways, for example, as 1285956 + 3364 = 1134^2 + 58^2 .

It is not an unprimeable number, because it can be changed into a prime (1289329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16077 + ... + 16156.

2^1289320 is an apocalyptic number.

1289320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1289320 is an abundant number, since it is smaller than the sum of its proper divisors (1611740).

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

1289320 is a wasteful number, since it uses less digits than its factorization.

1289320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32244 (or 32240 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1289320 is about 1135.4822763918. The cubic root of 1289320 is about 108.8395923524.

The spelling of 1289320 in words is "one million, two hundred eighty-nine thousand, three hundred twenty".