1287273 has 12 divisors (see below), whose sum is σ = 1859280. Its totient is φ = 791856.

The previous prime is 1287239. The next prime is 1287289. The reversal of 1287273 is 3727821.

It is not a de Polignac number, because 1287273 - 2¹³ = 1279081 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1287273.

It is not an unprimeable number, because it can be changed into a prime (1287233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 763 + ... + 1776.

It is an arithmetic number, because the mean of its divisors is an integer number (154940).

2^1287273 is an apocalyptic number.

1287273 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1287273 is a deficient number, since it is larger than the sum of its proper divisors (572007).

1287273 is a wasteful number, since it uses less digits than its factorization.

1287273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568 (or 2555 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 1287273 is about 1134.5805392302. The cubic root of 1287273 is about 108.7819618038.

The spelling of 1287273 in words is "one million, two hundred eighty-seven thousand, two hundred seventy-three".