1242685 has 4 divisors (see below), whose sum is σ = 1491228. Its totient is φ = 994144.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242685 is 5862421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131769 + 1110916 = 363^2 + 1054^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242685 - 2¹¹ = 1240637 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 124264 + ... + 124273.

It is an arithmetic number, because the mean of its divisors is an integer number (372807).

2^1242685 is an apocalyptic number.

It is an amenable number.

1242685 is a deficient number, since it is larger than the sum of its proper divisors (248543).

1242685 is an equidigital number, since it uses as much as digits as its factorization.

1242685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248542.

The product of its digits is 3840, while the sum is 28.

The square root of 1242685 is about 1114.7578212329. The cubic root of 1242685 is about 107.5111940750.

It can be divided in two parts, 124 and 2685, that added together give a square (2809 = 53²).

The spelling of 1242685 in words is "one million, two hundred forty-two thousand, six hundred eighty-five".