1247420689 has 8 divisors (see below), whose sum is σ = 1256381568. Its totient is φ = 1238492160.

The previous prime is 1247420651. The next prime is 1247420729. The reversal of 1247420689 is 9860247421.

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 1247420689 - 2⁹ = 1247420177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1247427689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72124 + ... + 87730.

It is an arithmetic number, because the mean of its divisors is an integer number (157047696).

Almost surely, 2^1247420689 is an apocalyptic number.

It is an amenable number.

1247420689 is a deficient number, since it is larger than the sum of its proper divisors (8960879).

1247420689 is a wasteful number, since it uses less digits than its factorization.

1247420689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16175.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 1247420689 is about 35318.8432568226. The cubic root of 1247420689 is about 1076.4759071962.

The spelling of 1247420689 in words is "one billion, two hundred forty-seven million, four hundred twenty thousand, six hundred eighty-nine".