1280420 has 24 divisors (see below), whose sum is σ = 2728824. Its totient is φ = 504576.

The previous prime is 1280417. The next prime is 1280431. The reversal of 1280420 is 240821.

It can be written as a sum of positive squares in 4 ways, for example, as 343396 + 937024 = 586^2 + 968^2 .

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, 1022 + ... + 1898.

It is an arithmetic number, because the mean of its divisors is an integer number (113701).

2^1280420 is an apocalyptic number.

1280420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280420 is an abundant number, since it is smaller than the sum of its proper divisors (1448404).

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

1280420 is a wasteful number, since it uses less digits than its factorization.

1280420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959 (or 957 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1280420 is about 1131.5564502048. The cubic root of 1280420 is about 108.5885789422.

The spelling of 1280420 in words is "one million, two hundred eighty thousand, four hundred twenty".