1244666789 has 4 divisors (see below), whose sum is σ = 1244799756. Its totient is φ = 1244533824.

The previous prime is 1244666779. The next prime is 1244666803. The reversal of 1244666789 is 9876664421.

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 1021313764 + 223353025 = 31958^2 + 14945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244666789 - 2²⁰ = 1243618213 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1244666789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244666779) 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 3 ways as a sum of consecutive naturals, for example, 51284 + ... + 71549.

It is an arithmetic number, because the mean of its divisors is an integer number (311199939).

Almost surely, 2^1244666789 is an apocalyptic number.

It is an amenable number.

1244666789 is a deficient number, since it is larger than the sum of its proper divisors (132967).

1244666789 is a wasteful number, since it uses less digits than its factorization.

1244666789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132966.

The product of its digits is 3483648, while the sum is 53.

The square root of 1244666789 is about 35279.8354446276. The cubic root of 1244666789 is about 1075.6831537269.

The spelling of 1244666789 in words is "one billion, two hundred forty-four million, six hundred sixty-six thousand, seven hundred eighty-nine".