1265749993 has 8 divisors (see below), whose sum is σ = 1296324008. Its totient is φ = 1235533824.

The previous prime is 1265749967. The next prime is 1265750023. The reversal of 1265749993 is 3999475621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14500864 + 1251249129 = 3808^2 + 35373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1265749993 - 2²⁵ = 1232195561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265749913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82296 + ... + 96457.

It is an arithmetic number, because the mean of its divisors is an integer number (162040501).

Almost surely, 2^1265749993 is an apocalyptic number.

It is an amenable number.

1265749993 is a deficient number, since it is larger than the sum of its proper divisors (30574015).

1265749993 is an equidigital number, since it uses as much as digits as its factorization.

1265749993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178923.

The product of its digits is 3674160, while the sum is 55.

The square root of 1265749993 is about 35577.3803560633. The cubic root of 1265749993 is about 1081.7227856646.

The spelling of 1265749993 in words is "one billion, two hundred sixty-five million, seven hundred forty-nine thousand, nine hundred ninety-three".