1266440129 has 8 divisors (see below), whose sum is σ = 1270160640. Its totient is φ = 1262726496.

The previous prime is 1266440113. The next prime is 1266440137. The reversal of 1266440129 is 9210446621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1266440129 - 2⁴ = 1266440113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266440159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 763469 + ... + 765125.

It is an arithmetic number, because the mean of its divisors is an integer number (158770080).

Almost surely, 2^1266440129 is an apocalyptic number.

It is an amenable number.

1266440129 is a deficient number, since it is larger than the sum of its proper divisors (3720511).

1266440129 is a wasteful number, since it uses less digits than its factorization.

1266440129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1266440129 is about 35587.0781183283. The cubic root of 1266440129 is about 1081.9193490201.

The spelling of 1266440129 in words is "one billion, two hundred sixty-six million, four hundred forty thousand, one hundred twenty-nine".