1242820849 has 8 divisors (see below), whose sum is σ = 1261101312. Its totient is φ = 1224562080.

The previous prime is 1242820841. The next prime is 1242820879. The reversal of 1242820849 is 9480282421.

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 1242820849 - 2³ = 1242820841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242820841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137112 + ... + 145894.

It is an arithmetic number, because the mean of its divisors is an integer number (157637664).

Almost surely, 2^1242820849 is an apocalyptic number.

It is an amenable number.

1242820849 is a deficient number, since it is larger than the sum of its proper divisors (18280463).

1242820849 is an equidigital number, since it uses as much as digits as its factorization.

1242820849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10847.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 1242820849 is about 35253.6643343639. The cubic root of 1242820849 is about 1075.1511160196.

The spelling of 1242820849 in words is "one billion, two hundred forty-two million, eight hundred twenty thousand, eight hundred forty-nine".