1266878423 has 4 divisors (see below), whose sum is σ = 1267557408. Its totient is φ = 1266199440.

The previous prime is 1266878419. The next prime is 1266878429. The reversal of 1266878423 is 3248786621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3248786621 = 1279 ⋅2540099.

It is a cyclic number.

It is not a de Polignac number, because 1266878423 - 2² = 1266878419 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 (1266878429) 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, 336686 + ... + 340427.

It is an arithmetic number, because the mean of its divisors is an integer number (316889352).

Almost surely, 2^1266878423 is an apocalyptic number.

1266878423 is a deficient number, since it is larger than the sum of its proper divisors (678985).

1266878423 is an equidigital number, since it uses as much as digits as its factorization.

1266878423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678984.

The product of its digits is 774144, while the sum is 47.

The square root of 1266878423 is about 35593.2356354406. The cubic root of 1266878423 is about 1082.0441460936.

The spelling of 1266878423 in words is "one billion, two hundred sixty-six million, eight hundred seventy-eight thousand, four hundred twenty-three".