1266440636 has 24 divisors (see below), whose sum is σ = 2403880416. Its totient is φ = 581434880.

The previous prime is 1266440627. The next prime is 1266440641. The reversal of 1266440636 is 6360446621.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1266440636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224336 + ... + 229911.

It is an arithmetic number, because the mean of its divisors is an integer number (100161684).

Almost surely, 2^1266440636 is an apocalyptic number.

It is an amenable number.

1266440636 is a deficient number, since it is larger than the sum of its proper divisors (1137439780).

1266440636 is a wasteful number, since it uses less digits than its factorization.

1266440636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454309 (or 454307 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 1266440636 is about 35587.0852416997. The cubic root of 1266440636 is about 1081.9194933967.

The spelling of 1266440636 in words is "one billion, two hundred sixty-six million, four hundred forty thousand, six hundred thirty-six".