1288385 has 16 divisors (see below), whose sum is σ = 1786752. Its totient is φ = 873600.

The previous prime is 1288367. The next prime is 1288393. The reversal of 1288385 is 5838821.

It is not a de Polignac number, because 1288385 - 2¹⁰ = 1287361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4445 + ... + 4725.

It is an arithmetic number, because the mean of its divisors is an integer number (111672).

2^1288385 is an apocalyptic number.

It is an amenable number.

1288385 is a deficient number, since it is larger than the sum of its proper divisors (498367).

1288385 is a wasteful number, since it uses less digits than its factorization.

1288385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424.

The product of its digits is 15360, while the sum is 35.

The square root of 1288385 is about 1135.0704823931. The cubic root of 1288385 is about 108.8132762508.

The spelling of 1288385 in words is "one million, two hundred eighty-eight thousand, three hundred eighty-five".