1268378719 has 4 divisors (see below), whose sum is σ = 1286243280. Its totient is φ = 1250514160.

The previous prime is 1268378717. The next prime is 1268378729. The reversal of 1268378719 is 9178738621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1268378719 - 2¹ = 1268378717 is a prime.

It is a super-2 number, since 2×1268378719² = 3217569149624161922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268378717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8932174 + ... + 8932315.

It is an arithmetic number, because the mean of its divisors is an integer number (321560820).

Almost surely, 2^1268378719 is an apocalyptic number.

1268378719 is a deficient number, since it is larger than the sum of its proper divisors (17864561).

1268378719 is an equidigital number, since it uses as much as digits as its factorization.

1268378719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17864560.

The product of its digits is 1016064, while the sum is 52.

The square root of 1268378719 is about 35614.3049770735. The cubic root of 1268378719 is about 1082.4711131612.

The spelling of 1268378719 in words is "one billion, two hundred sixty-eight million, three hundred seventy-eight thousand, seven hundred nineteen".