1268638 has 8 divisors (see below), whose sum is σ = 2174832. Its totient is φ = 543696.

The previous prime is 1268633. The next prime is 1268669. The reversal of 1268638 is 8368621.

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 (1268633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45295 + ... + 45322.

It is an arithmetic number, because the mean of its divisors is an integer number (271854).

2^1268638 is an apocalyptic number.

1268638 is a deficient number, since it is larger than the sum of its proper divisors (906194).

1268638 is an equidigital number, since it uses as much as digits as its factorization.

1268638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90626.

The product of its digits is 13824, while the sum is 34.

The square root of 1268638 is about 1126.3383150723. The cubic root of 1268638 is about 108.2544867439.

The spelling of 1268638 in words is "one million, two hundred sixty-eight thousand, six hundred thirty-eight".