1287279 has 32 divisors (see below), whose sum is σ = 2240000. Its totient is φ = 730296.

The previous prime is 1287239. The next prime is 1287289. The reversal of 1287279 is 9727821.

It is not a de Polignac number, because 1287279 - 2¹¹ = 1285231 is a prime.

1287279 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9192 + ... + 9330.

It is an arithmetic number, because the mean of its divisors is an integer number (70000).

2^1287279 is an apocalyptic number.

1287279 is a deficient number, since it is larger than the sum of its proper divisors (952721).

1287279 is an equidigital number, since it uses as much as digits as its factorization.

1287279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 149 counting only the distinct ones).

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

The square root of 1287279 is about 1134.5831833762. The cubic root of 1287279 is about 108.7821308150.

The spelling of 1287279 in words is "one million, two hundred eighty-seven thousand, two hundred seventy-nine".