1242742686 has 8 divisors (see below), whose sum is σ = 2485485384. Its totient is φ = 414247560.

The previous prime is 1242742667. The next prime is 1242742723. The reversal of 1242742686 is 6862472421.

It is a happy number.

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

1242742686 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103561885 + ... + 103561896.

It is an arithmetic number, because the mean of its divisors is an integer number (310685673).

Almost surely, 2^1242742686 is an apocalyptic number.

1242742686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242742686 is a wasteful number, since it uses less digits than its factorization.

1242742686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207123786.

The product of its digits is 258048, while the sum is 42.

The square root of 1242742686 is about 35252.5557371377. Note that the first 3 decimals coincide. The cubic root of 1242742686 is about 1075.1285762200.

The spelling of 1242742686 in words is "one billion, two hundred forty-two million, seven hundred forty-two thousand, six hundred eighty-six".