1280844 has 36 divisors (see below), whose sum is σ = 3310944. Its totient is φ = 417312.

The previous prime is 1280837. The next prime is 1280857. The reversal of 1280844 is 4480821.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1280844² = 3281122704672, which contains 22 as substring.

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, 1314 + ... + 2070.

2^1280844 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 1280844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1655472).

1280844 is an abundant number, since it is smaller than the sum of its proper divisors (2030100).

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

1280844 is a wasteful number, since it uses less digits than its factorization.

1280844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 1280844 is about 1131.7437872593. The cubic root of 1280844 is about 108.6005636754.

The spelling of 1280844 in words is "one million, two hundred eighty thousand, eight hundred forty-four".