1288642 has 8 divisors (see below), whose sum is σ = 1969596. Its totient is φ = 632112.

The previous prime is 1288613. The next prime is 1288643. The reversal of 1288642 is 2468821.

It can be written as a sum of positive squares in 2 ways, for example, as 1252161 + 36481 = 1119^2 + 191^2 .

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

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1288643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5973 + ... + 6184.

2^1288642 is an apocalyptic number.

1288642 is a deficient number, since it is larger than the sum of its proper divisors (680954).

1288642 is a wasteful number, since it uses less digits than its factorization.

1288642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12212.

The product of its digits is 6144, while the sum is 31.

The square root of 1288642 is about 1135.1836855769. The cubic root of 1288642 is about 108.8205109290.

The spelling of 1288642 in words is "one million, two hundred eighty-eight thousand, six hundred forty-two".