1280566 has 24 divisors (see below), whose sum is σ = 2277720. Its totient is φ = 538272.

The previous prime is 1280561. The next prime is 1280567. The reversal of 1280566 is 6650821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7065 + ... + 7243.

It is an arithmetic number, because the mean of its divisors is an integer number (94905).

2^1280566 is an apocalyptic number.

1280566 is the 716-th heptagonal number.

1280566 is a deficient number, since it is larger than the sum of its proper divisors (997154).

1280566 is a wasteful number, since it uses less digits than its factorization.

1280566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1280566 is about 1131.6209612763. The cubic root of 1280566 is about 108.5927060594.

The spelling of 1280566 in words is "one million, two hundred eighty thousand, five hundred sixty-six".