1266136340 has 48 divisors (see below), whose sum is σ = 3049560192. Its totient is φ = 432556416.

The previous prime is 1266136331. The next prime is 1266136351. The reversal of 1266136340 is 436316621.

It is a junction number, because it is equal to n+sod(n) for n = 1266136297 and 1266136306.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 23642 + ... + 55598.

It is an arithmetic number, because the mean of its divisors is an integer number (63532504).

Almost surely, 2^1266136340 is an apocalyptic number.

1266136340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266136340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524780096).

1266136340 is an abundant number, since it is smaller than the sum of its proper divisors (1783423852).

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

1266136340 is a wasteful number, since it uses less digits than its factorization.

1266136340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32256 (or 32254 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 1266136340 is about 35582.8096136323. The cubic root of 1266136340 is about 1081.8328331574.

The spelling of 1266136340 in words is "one billion, two hundred sixty-six million, one hundred thirty-six thousand, three hundred forty".