1280904 has 48 divisors (see below), whose sum is σ = 3435600. Its totient is φ = 396864.

The previous prime is 1280887. The next prime is 1280921. The reversal of 1280904 is 4090821.

It is an interprime number because it is at equal distance from previous prime (1280887) and next prime (1280921).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24142 + ... + 24194.

It is an arithmetic number, because the mean of its divisors is an integer number (71575).

2^1280904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1717800).

1280904 is an abundant number, since it is smaller than the sum of its proper divisors (2154696).

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

1280904 is a wasteful number, since it uses less digits than its factorization.

1280904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1280904 is about 1131.7702947153. The cubic root of 1280904 is about 108.6022594146.

The spelling of 1280904 in words is "one million, two hundred eighty thousand, nine hundred four".