1242656 has 12 divisors (see below), whose sum is σ = 2446542. Its totient is φ = 621312.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242656 is 6562421.

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 67600 = 1084^2 + 260^2 .

It is an Ulam number.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19385 + ... + 19448.

2^1242656 is an apocalyptic number.

1242656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1242656 is a deficient number, since it is larger than the sum of its proper divisors (1203886).

1242656 is an equidigital number, since it uses as much as digits as its factorization.

1242656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38843 (or 38835 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 1242656 is about 1114.7448138475. The cubic root of 1242656 is about 107.5103577545.

The spelling of 1242656 in words is "one million, two hundred forty-two thousand, six hundred fifty-six".