1288409 has 12 divisors (see below), whose sum is σ = 1408176. Its totient is φ = 1177848.

The previous prime is 1288393. The next prime is 1288421. The reversal of 1288409 is 9048821.

It is a happy number.

It is not a de Polignac number, because 1288409 - 2⁴ = 1288393 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288429) 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 11 ways as a sum of consecutive naturals, for example, 15482 + ... + 15564.

It is an arithmetic number, because the mean of its divisors is an integer number (117348).

2^1288409 is an apocalyptic number.

1288409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1288409 is a deficient number, since it is larger than the sum of its proper divisors (119767).

1288409 is an equidigital number, since it uses as much as digits as its factorization.

1288409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1288409 is about 1135.0810543745. The cubic root of 1288409 is about 108.8139519035.

The spelling of 1288409 in words is "one million, two hundred eighty-eight thousand, four hundred nine".