1272820747 has 16 divisors (see below), whose sum is σ = 1425340800. Its totient is φ = 1126805440.

The previous prime is 1272820721. The next prime is 1272820751. The reversal of 1272820747 is 7470282721.

It is a cyclic number.

It is not a de Polignac number, because 1272820747 - 2¹¹ = 1272818699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272820777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60279 + ... + 78607.

It is an arithmetic number, because the mean of its divisors is an integer number (89083800).

Almost surely, 2^1272820747 is an apocalyptic number.

1272820747 is a deficient number, since it is larger than the sum of its proper divisors (152520053).

1272820747 is a wasteful number, since it uses less digits than its factorization.

1272820747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18506.

The product of its (nonzero) digits is 87808, while the sum is 40.

The square root of 1272820747 is about 35676.6134463461. The cubic root of 1272820747 is about 1083.7332926246.

The spelling of 1272820747 in words is "one billion, two hundred seventy-two million, eight hundred twenty thousand, seven hundred forty-seven".