1273742755 has 4 divisors (see below), whose sum is σ = 1528491312. Its totient is φ = 1018994200.

The previous prime is 1273742753. The next prime is 1273742779. The reversal of 1273742755 is 5572473721.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1273742755 - 2¹ = 1273742753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1273742753) 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, 127374271 + ... + 127374280.

It is an arithmetic number, because the mean of its divisors is an integer number (382122828).

Almost surely, 2^1273742755 is an apocalyptic number.

1273742755 is a deficient number, since it is larger than the sum of its proper divisors (254748557).

1273742755 is an equidigital number, since it uses as much as digits as its factorization.

1273742755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254748556.

The product of its digits is 411600, while the sum is 43.

The square root of 1273742755 is about 35689.5328492823. The cubic root of 1273742755 is about 1083.9949083039.

The spelling of 1273742755 in words is "one billion, two hundred seventy-three million, seven hundred forty-two thousand, seven hundred fifty-five".