1289838 has 16 divisors (see below), whose sum is σ = 2814336. Its totient is φ = 390840.

The previous prime is 1289831. The next prime is 1289839. The reversal of 1289838 is 8389821.

It is a junction number, because it is equal to n+sod(n) for n = 1289796 and 1289805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9706 + ... + 9837.

It is an arithmetic number, because the mean of its divisors is an integer number (175896).

2^1289838 is an apocalyptic number.

1289838 is an abundant number, since it is smaller than the sum of its proper divisors (1524498).

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

1289838 is a wasteful number, since it uses less digits than its factorization.

1289838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19559.

The product of its digits is 27648, while the sum is 39.

The square root of 1289838 is about 1135.7103503975. The cubic root of 1289838 is about 108.8541662777.

The spelling of 1289838 in words is "one million, two hundred eighty-nine thousand, eight hundred thirty-eight".