1281616 has 20 divisors (see below), whose sum is σ = 2838112. Its totient is φ = 549216.

The previous prime is 1281587. The next prime is 1281649. The reversal of 1281616 is 6161821.

1281616 is a modest number, since divided by 1616 gives 128 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5610 + ... + 5833.

2^1281616 is an apocalyptic number.

1281616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1281616 is an abundant number, since it is smaller than the sum of its proper divisors (1556496).

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

1281616 is a wasteful number, since it uses less digits than its factorization.

1281616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11458 (or 11452 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 1281616 is about 1132.0848024773. The cubic root of 1281616 is about 108.6223781448.

The spelling of 1281616 in words is "one million, two hundred eighty-one thousand, six hundred sixteen".