1268289309 has 8 divisors (see below), whose sum is σ = 1932631360. Its totient is φ = 724736736.

The previous prime is 1268289307. The next prime is 1268289331. The reversal of 1268289309 is 9039828621.

1268289309 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1268289309 - 2¹ = 1268289307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268289307) 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, 30197344 + ... + 30197385.

It is an arithmetic number, because the mean of its divisors is an integer number (241578920).

Almost surely, 2^1268289309 is an apocalyptic number.

It is an amenable number.

1268289309 is a deficient number, since it is larger than the sum of its proper divisors (664342051).

1268289309 is an equidigital number, since it uses as much as digits as its factorization.

1268289309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60394739.

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 1268289309 is about 35613.0497009172. The cubic root of 1268289309 is about 1082.4456775361.

The spelling of 1268289309 in words is "one billion, two hundred sixty-eight million, two hundred eighty-nine thousand, three hundred nine".