1242655 has 8 divisors (see below), whose sum is σ = 1501632. Its totient is φ = 987168.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242655 is 5562421.

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

It is a cyclic number.

It is not a de Polignac number, because 1242655 - 2⁵ = 1242623 is a prime.

It is a d-powerful number, because it can be written as 1 + 2¹⁸ + 4⁸ + 2¹⁹ + 6² + 5² + 5⁸ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7 + ... + 1576.

It is an arithmetic number, because the mean of its divisors is an integer number (187704).

2^1242655 is an apocalyptic number.

1242655 is a deficient number, since it is larger than the sum of its proper divisors (258977).

1242655 is a wasteful number, since it uses less digits than its factorization.

1242655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745.

The product of its digits is 2400, while the sum is 25.

The square root of 1242655 is about 1114.7443653143. The cubic root of 1242655 is about 107.5103289156.

The spelling of 1242655 in words is "one million, two hundred forty-two thousand, six hundred fifty-five".