1266236423 has 4 divisors (see below), whose sum is σ = 1268023080. Its totient is φ = 1264449768.

The previous prime is 1266236407. The next prime is 1266236431. The reversal of 1266236423 is 3246326621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3246326621 = 9769 ⋅332309.

It is a cyclic number.

It is not a de Polignac number, because 1266236423 - 2⁴ = 1266236407 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 (1266236453) 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, 892265 + ... + 893682.

It is an arithmetic number, because the mean of its divisors is an integer number (317005770).

Almost surely, 2^1266236423 is an apocalyptic number.

1266236423 is a deficient number, since it is larger than the sum of its proper divisors (1786657).

1266236423 is an equidigital number, since it uses as much as digits as its factorization.

1266236423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786656.

The product of its digits is 62208, while the sum is 35.

The square root of 1266236423 is about 35584.2159250418. The cubic root of 1266236423 is about 1081.8613372553.

The spelling of 1266236423 in words is "one billion, two hundred sixty-six million, two hundred thirty-six thousand, four hundred twenty-three".