1280520 has 48 divisors (see below), whose sum is σ = 4162860. Its totient is φ = 341376.

The previous prime is 1280519. The next prime is 1280537. The reversal of 1280520 is 250821.

It can be written as a sum of positive squares in 2 ways, for example, as 1179396 + 101124 = 1086^2 + 318^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1280493 and 1280502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1419 + ... + 2138.

2^1280520 is an apocalyptic number.

1280520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280520 is an abundant number, since it is smaller than the sum of its proper divisors (2882340).

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

1280520 is a wasteful number, since it uses less digits than its factorization.

1280520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574 (or 3567 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1280520 is about 1131.6006362671. The cubic root of 1280520 is about 108.5914057686.

The spelling of 1280520 in words is "one million, two hundred eighty thousand, five hundred twenty".