1272845 has 16 divisors (see below), whose sum is σ = 1790208. Its totient is φ = 850560.

The previous prime is 1272833. The next prime is 1272847. The reversal of 1272845 is 5482721.

It is not a de Polignac number, because 1272845 - 2⁸ = 1272589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 992 + ... + 1878.

It is an arithmetic number, because the mean of its divisors is an integer number (111888).

2^1272845 is an apocalyptic number.

It is an amenable number.

1272845 is a deficient number, since it is larger than the sum of its proper divisors (517363).

1272845 is an equidigital number, since it uses as much as digits as its factorization.

1272845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940.

The product of its digits is 4480, while the sum is 29.

The square root of 1272845 is about 1128.2043254659. The cubic root of 1272845 is about 108.3740175923.

The spelling of 1272845 in words is "one million, two hundred seventy-two thousand, eight hundred forty-five".