1242688 has 14 divisors (see below), whose sum is σ = 2466086. Its totient is φ = 621312.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242688 is 8862421.

It can be written as a sum of positive squares in only one way, i.e., 652864 + 589824 = 808^2 + 768^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9645 + ... + 9772.

It is an arithmetic number, because the mean of its divisors is an integer number (176149).

2^1242688 is an apocalyptic number.

It is an amenable number.

1242688 is a deficient number, since it is larger than the sum of its proper divisors (1223398).

1242688 is an equidigital number, since it uses as much as digits as its factorization.

1242688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19429 (or 19419 counting only the distinct ones).

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

The square root of 1242688 is about 1114.7591668159. The cubic root of 1242688 is about 107.5112805902.

Subtracting from 1242688 its product of digits (6144), we obtain a square (1236544 = 1112²).

The spelling of 1242688 in words is "one million, two hundred forty-two thousand, six hundred eighty-eight".