1268978019 has 16 divisors (see below), whose sum is σ = 1709316000. Its totient is φ = 837353216.

The previous prime is 1268978017. The next prime is 1268978021. The reversal of 1268978019 is 9108798621.

It is an interprime number because it is at equal distance from previous prime (1268978017) and next prime (1268978021).

It is a cyclic number.

It is not a de Polignac number, because 1268978019 - 2¹ = 1268978017 is a prime.

It is a super-2 number, since 2×1268978019² = 3220610425410328722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1268978017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126127 + ... + 135815.

It is an arithmetic number, because the mean of its divisors is an integer number (106832250).

Almost surely, 2^1268978019 is an apocalyptic number.

1268978019 is a deficient number, since it is larger than the sum of its proper divisors (440337981).

1268978019 is a wasteful number, since it uses less digits than its factorization.

1268978019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10134.

The product of its (nonzero) digits is 435456, while the sum is 51.

The square root of 1268978019 is about 35622.7177374214. The cubic root of 1268978019 is about 1082.6415729727.

The spelling of 1268978019 in words is "one billion, two hundred sixty-eight million, nine hundred seventy-eight thousand, nineteen".