1265440136 has 16 divisors (see below), whose sum is σ = 2378211840. Its totient is φ = 631250320.

The previous prime is 1265440133. The next prime is 1265440199. The reversal of 1265440136 is 6310445621.

It is not an unprimeable number, because it can be changed into a prime (1265440133) 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, 180056 + ... + 186951.

It is an arithmetic number, because the mean of its divisors is an integer number (148638240).

Almost surely, 2^1265440136 is an apocalyptic number.

It is an amenable number.

1265440136 is a deficient number, since it is larger than the sum of its proper divisors (1112771704).

1265440136 is a wasteful number, since it uses less digits than its factorization.

1265440136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367444 (or 367440 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1265440136 is about 35573.0253984673. The cubic root of 1265440136 is about 1081.6345094823.

Adding to 1265440136 its reverse (6310445621), we get a palindrome (7575885757).

The spelling of 1265440136 in words is "one billion, two hundred sixty-five million, four hundred forty thousand, one hundred thirty-six".