1280404 has 6 divisors (see below), whose sum is σ = 2240714. Its totient is φ = 640200.

The previous prime is 1280401. The next prime is 1280407. The reversal of 1280404 is 4040821.

It is an interprime number because it is at equal distance from previous prime (1280401) and next prime (1280407).

It can be written as a sum of positive squares in only one way, i.e., 980100 + 300304 = 990^2 + 548^2 .

1280404 is a modest number, since divided by 404 gives 128 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160047 + ... + 160054.

2^1280404 is an apocalyptic number.

It is an amenable number.

1280404 is a deficient number, since it is larger than the sum of its proper divisors (960310).

1280404 is a wasteful number, since it uses less digits than its factorization.

1280404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320105 (or 320103 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1280404 is about 1131.5493802747. The cubic root of 1280404 is about 108.5881266363.

The spelling of 1280404 in words is "one million, two hundred eighty thousand, four hundred four".