1280356 has 24 divisors (see below), whose sum is σ = 2794176. Its totient is φ = 498720.

The previous prime is 1280333. The next prime is 1280371. The reversal of 1280356 is 6530821.

It is a happy number.

It is a super-2 number, since 2×1280356² = 3278622973472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1280356.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1771 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (116424).

2^1280356 is an apocalyptic number.

It is an amenable number.

1280356 is an abundant number, since it is smaller than the sum of its proper divisors (1513820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1280356 is a wasteful number, since it uses less digits than its factorization.

1280356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4179 (or 4177 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1280356 is about 1131.5281702194. The cubic root of 1280356 is about 108.5867696961.

The spelling of 1280356 in words is "one million, two hundred eighty thousand, three hundred fifty-six".