1289399 has 8 divisors (see below), whose sum is σ = 1385280. Its totient is φ = 1195776.

The previous prime is 1289381. The next prime is 1289401. The reversal of 1289399 is 9939821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1289399 - 2¹⁶ = 1223863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289329) 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, 722 + ... + 1760.

It is an arithmetic number, because the mean of its divisors is an integer number (173160).

2^1289399 is an apocalyptic number.

1289399 is a deficient number, since it is larger than the sum of its proper divisors (95881).

1289399 is a wasteful number, since it uses less digits than its factorization.

1289399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129.

The product of its digits is 34992, while the sum is 41.

The square root of 1289399 is about 1135.5170628397. The cubic root of 1289399 is about 108.8418152689.

The spelling of 1289399 in words is "one million, two hundred eighty-nine thousand, three hundred ninety-nine".