1272785 has 4 divisors (see below), whose sum is σ = 1527348. Its totient is φ = 1018224.

The previous prime is 1272749. The next prime is 1272811. The reversal of 1272785 is 5872721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5872721 = 1423 ⋅4127.

It can be written as a sum of positive squares in 2 ways, for example, as 565504 + 707281 = 752^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272785 - 2¹⁶ = 1207249 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127274 + ... + 127283.

It is an arithmetic number, because the mean of its divisors is an integer number (381837).

2^1272785 is an apocalyptic number.

It is an amenable number.

1272785 is a deficient number, since it is larger than the sum of its proper divisors (254563).

1272785 is an equidigital number, since it uses as much as digits as its factorization.

1272785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254562.

The product of its digits is 7840, while the sum is 32.

The square root of 1272785 is about 1128.1777342245. The cubic root of 1272785 is about 108.3723147028.

The spelling of 1272785 in words is "one million, two hundred seventy-two thousand, seven hundred eighty-five".