1288405 has 8 divisors (see below), whose sum is σ = 1556352. Its totient is φ = 1023888.

The previous prime is 1288393. The next prime is 1288421. The reversal of 1288405 is 5048821.

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 1288405 - 2¹⁷ = 1157333 is a prime.

It is a Duffinian number.

1288405 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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, 64 + ... + 1606.

It is an arithmetic number, because the mean of its divisors is an integer number (194544).

2^1288405 is an apocalyptic number.

It is an amenable number.

1288405 is a deficient number, since it is larger than the sum of its proper divisors (267947).

1288405 is a wasteful number, since it uses less digits than its factorization.

1288405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 1288405 is about 1135.0792923845. The cubic root of 1288405 is about 108.8138392953.

The spelling of 1288405 in words is "one million, two hundred eighty-eight thousand, four hundred five".