1268380857 has 4 divisors (see below), whose sum is σ = 1691174480. Its totient is φ = 845587236.

The previous prime is 1268380807. The next prime is 1268380909. The reversal of 1268380857 is 7580838621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1268380857 - 2⁸ = 1268380601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268380807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211396807 + ... + 211396812.

It is an arithmetic number, because the mean of its divisors is an integer number (422793620).

Almost surely, 2^1268380857 is an apocalyptic number.

It is an amenable number.

1268380857 is a deficient number, since it is larger than the sum of its proper divisors (422793623).

1268380857 is an equidigital number, since it uses as much as digits as its factorization.

1268380857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422793622.

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 1268380857 is about 35614.3349930895. The cubic root of 1268380857 is about 1082.4717213712.

The spelling of 1268380857 in words is "one billion, two hundred sixty-eight million, three hundred eighty thousand, eight hundred fifty-seven".