1129280 has 28 divisors (see below), whose sum is σ = 2689860. Its totient is φ = 451584.

The previous prime is 1129253. The next prime is 1129283. The reversal of 1129280 is 829211.

It can be written as a sum of positive squares in 2 ways, for example, as 238144 + 891136 = 488^2 + 944^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445 + ... + 2084.

2^1129280 is an apocalyptic number.

1129280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1129280 is an abundant number, since it is smaller than the sum of its proper divisors (1560580).

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

1129280 is an equidigital number, since it uses as much as digits as its factorization.

1129280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3546 (or 3536 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1129280 is about 1062.6758677979. The cubic root of 1129280 is about 104.1359169681.

The spelling of 1129280 in words is "one million, one hundred twenty-nine thousand, two hundred eighty".