1272789 has 24 divisors (see below), whose sum is σ = 2134080. Its totient is φ = 715968.

The previous prime is 1272749. The next prime is 1272811. The reversal of 1272789 is 9872721.

It is not a de Polignac number, because 1272789 - 2¹³ = 1264597 is a prime.

It is an alternating number because its digits alternate between odd and even.

1272789 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5494 + ... + 5720.

It is an arithmetic number, because the mean of its divisors is an integer number (88920).

2^1272789 is an apocalyptic number.

It is an amenable number.

1272789 is a deficient number, since it is larger than the sum of its proper divisors (861291).

1272789 is a wasteful number, since it uses less digits than its factorization.

1272789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 326 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 1272789 is about 1128.1795069935. The cubic root of 1272789 is about 108.3724282305.

It can be divided in two parts, 127 and 2789, that added together give a square (2916 = 54²).

The spelling of 1272789 in words is "one million, two hundred seventy-two thousand, seven hundred eighty-nine".