1280279 has 16 divisors (see below), whose sum is σ = 1720320. Its totient is φ = 920160.

The previous prime is 1280267. The next prime is 1280281. The reversal of 1280279 is 9720821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1280279 - 2⁸ = 1280023 is a prime.

It is a super-2 number, since 2×1280279² = 3278228635682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280179) 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, 362 + ... + 1640.

It is an arithmetic number, because the mean of its divisors is an integer number (107520).

2^1280279 is an apocalyptic number.

1280279 is a deficient number, since it is larger than the sum of its proper divisors (440041).

1280279 is a wasteful number, since it uses less digits than its factorization.

1280279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1280279 is about 1131.4941449252. The cubic root of 1280279 is about 108.5845928669.

The spelling of 1280279 in words is "one million, two hundred eighty thousand, two hundred seventy-nine".