1265767243 has 12 divisors (see below), whose sum is σ = 1373136840. Its totient is φ = 1166258496.

The previous prime is 1265767207. The next prime is 1265767271. The reversal of 1265767243 is 3427675621.

It is not a de Polignac number, because 1265767243 - 2²¹ = 1263670091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1265767243.

It is not an unprimeable number, because it can be changed into a prime (1265767343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89580 + ... + 102742.

It is an arithmetic number, because the mean of its divisors is an integer number (114428070).

Almost surely, 2^1265767243 is an apocalyptic number.

1265767243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1265767243 is a deficient number, since it is larger than the sum of its proper divisors (107369597).

1265767243 is a wasteful number, since it uses less digits than its factorization.

1265767243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13758 (or 13745 counting only the distinct ones).

The product of its digits is 423360, while the sum is 43.

The square root of 1265767243 is about 35577.6227845538. The cubic root of 1265767243 is about 1081.7276996507.

The spelling of 1265767243 in words is "one billion, two hundred sixty-five million, seven hundred sixty-seven thousand, two hundred forty-three".