1272732385 has 16 divisors (see below), whose sum is σ = 1608572160. Its totient is φ = 964051200.

The previous prime is 1272732371. The next prime is 1272732389. The reversal of 1272732385 is 5832372721.

It is a de Polignac number, because none of the positive numbers 2^k-1272732385 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1272732389) 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, 263704 + ... + 268486.

It is an arithmetic number, because the mean of its divisors is an integer number (100535760).

Almost surely, 2^1272732385 is an apocalyptic number.

It is an amenable number.

1272732385 is a deficient number, since it is larger than the sum of its proper divisors (335839775).

1272732385 is a wasteful number, since it uses less digits than its factorization.

1272732385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7608.

The product of its digits is 141120, while the sum is 40.

The square root of 1272732385 is about 35675.3750505864. The cubic root of 1272732385 is about 1083.7082136658.

The spelling of 1272732385 in words is "one billion, two hundred seventy-two million, seven hundred thirty-two thousand, three hundred eighty-five".