1266290943 has 4 divisors (see below), whose sum is σ = 1688387928. Its totient is φ = 844193960.

The previous prime is 1266290941. The next prime is 1266290947. The reversal of 1266290943 is 3490926621.

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 1266290943 - 2¹ = 1266290941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266290895 and 1266290904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266290941) 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, 211048488 + ... + 211048493.

It is an arithmetic number, because the mean of its divisors is an integer number (422096982).

Almost surely, 2^1266290943 is an apocalyptic number.

1266290943 is a deficient number, since it is larger than the sum of its proper divisors (422096985).

1266290943 is an equidigital number, since it uses as much as digits as its factorization.

1266290943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422096984.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 1266290943 is about 35584.9819867876. The cubic root of 1266290943 is about 1081.8768641697.

The spelling of 1266290943 in words is "one billion, two hundred sixty-six million, two hundred ninety thousand, nine hundred forty-three".