1288646 has 8 divisors (see below), whose sum is σ = 1974240. Its totient is φ = 630568.

The previous prime is 1288643. The next prime is 1288649. The reversal of 1288646 is 6468821.

It is an interprime number because it is at equal distance from previous prime (1288643) and next prime (1288649).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288643) 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 3 ways as a sum of consecutive naturals, for example, 6761 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (246780).

2^1288646 is an apocalyptic number.

1288646 is a deficient number, since it is larger than the sum of its proper divisors (685594).

1288646 is a wasteful number, since it uses less digits than its factorization.

1288646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13758.

The product of its digits is 18432, while the sum is 35.

The square root of 1288646 is about 1135.1854474050. The cubic root of 1288646 is about 108.8206235234.

The spelling of 1288646 in words is "one million, two hundred eighty-eight thousand, six hundred forty-six".