1261280 has 24 divisors (see below), whose sum is σ = 2980152. Its totient is φ = 504448.

The previous prime is 1261279. The next prime is 1261289. The reversal of 1261280 is 821621.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3782 + ... + 4101.

It is an arithmetic number, because the mean of its divisors is an integer number (124173).

2^1261280 is an apocalyptic number.

1261280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261280 is an abundant number, since it is smaller than the sum of its proper divisors (1718872).

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

1261280 is an equidigital number, since it uses as much as digits as its factorization.

1261280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7898 (or 7890 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1261280 is about 1123.0672286199. The cubic root of 1261280 is about 108.0447916630.

The spelling of 1261280 in words is "one million, two hundred sixty-one thousand, two hundred eighty".