1272772721 has 8 divisors (see below), whose sum is σ = 1412013600. Its totient is φ = 1137454240.

The previous prime is 1272772681. The next prime is 1272772727.

1272772721 is nontrivially palindromic in base 10.

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 1272772721 - 2¹⁰ = 1272771697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272772727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 979916 + ... + 981213.

It is an arithmetic number, because the mean of its divisors is an integer number (176501700).

Almost surely, 2^1272772721 is an apocalyptic number.

1272772721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1272772721 is a deficient number, since it is larger than the sum of its proper divisors (139240879).

1272772721 is a wasteful number, since it uses less digits than its factorization.

1272772721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961199.

The product of its digits is 38416, while the sum is 38.

The square root of 1272772721 is about 35675.9403660226. The cubic root of 1272772721 is about 1083.7196619989.

The spelling of 1272772721 in words is "one billion, two hundred seventy-two million, seven hundred seventy-two thousand, seven hundred twenty-one".