1289928 has 32 divisors (see below), whose sum is σ = 3274560. Its totient is φ = 423360.

The previous prime is 1289927. The next prime is 1289933. The reversal of 1289928 is 8299821.

It is not an unprimeable number, because it can be changed into a prime (1289921) 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 in 7 ways as a sum of consecutive naturals, for example, 1326 + ... + 2082.

It is an arithmetic number, because the mean of its divisors is an integer number (102330).

2^1289928 is an apocalyptic number.

It is an amenable number.

1289928 is an abundant number, since it is smaller than the sum of its proper divisors (1984632).

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

1289928 is a wasteful number, since it uses less digits than its factorization.

1289928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 833 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 1289928 is about 1135.7499724851. The cubic root of 1289928 is about 108.8566980290.

The spelling of 1289928 in words is "one million, two hundred eighty-nine thousand, nine hundred twenty-eight".