1272746749 has 8 divisors (see below), whose sum is σ = 1341575840. Its totient is φ = 1204101936.

The previous prime is 1272746747. The next prime is 1272746759. The reversal of 1272746749 is 9476472721.

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 1272746749 - 2¹ = 1272746747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272746747) 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, 31767 + ... + 59620.

It is an arithmetic number, because the mean of its divisors is an integer number (167696980).

Almost surely, 2^1272746749 is an apocalyptic number.

1272746749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1272746749 is a deficient number, since it is larger than the sum of its proper divisors (68829091).

1272746749 is an equidigital number, since it uses as much as digits as its factorization.

1272746749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92139.

The product of its digits is 1185408, while the sum is 49.

The square root of 1272746749 is about 35675.5763653511. The cubic root of 1272746749 is about 1083.7122905444.

The spelling of 1272746749 in words is "one billion, two hundred seventy-two million, seven hundred forty-six thousand, seven hundred forty-nine".