1266640134 has 16 divisors (see below), whose sum is σ = 2620635120. Its totient is φ = 407654240.

The previous prime is 1266640127. The next prime is 1266640139. The reversal of 1266640134 is 4310466621.

It is a junction number, because it is equal to n+sod(n) for n = 1266640095 and 1266640104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266640139) 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, 3639597 + ... + 3639944.

It is an arithmetic number, because the mean of its divisors is an integer number (163789695).

Almost surely, 2^1266640134 is an apocalyptic number.

1266640134 is an abundant number, since it is smaller than the sum of its proper divisors (1353994986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266640134 is a wasteful number, since it uses less digits than its factorization.

1266640134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7279575.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 1266640134 is about 35589.8880863652. Note that the first 3 decimals coincide. The cubic root of 1266640134 is about 1081.9763007555.

The spelling of 1266640134 in words is "one billion, two hundred sixty-six million, six hundred forty thousand, one hundred thirty-four".