1242820705 has 8 divisors (see below), whose sum is σ = 1704439872. Its totient is φ = 852219888.

The previous prime is 1242820703. The next prime is 1242820739. The reversal of 1242820705 is 5070282421.

It is a happy number.

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 1242820705 - 2¹ = 1242820703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242820703) by changing a digit.

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, 17754547 + ... + 17754616.

It is an arithmetic number, because the mean of its divisors is an integer number (213054984).

Almost surely, 2^1242820705 is an apocalyptic number.

It is an amenable number.

1242820705 is a deficient number, since it is larger than the sum of its proper divisors (461619167).

1242820705 is an equidigital number, since it uses as much as digits as its factorization.

1242820705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35509175.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 1242820705 is about 35253.6622920229. The cubic root of 1242820705 is about 1075.1510744953.

It can be divided in two parts, 12428 and 20705, that added together give a palindrome (33133).

The spelling of 1242820705 in words is "one billion, two hundred forty-two million, eight hundred twenty thousand, seven hundred five".