1305856 has 18 divisors (see below), whose sum is σ = 2607122. Its totient is φ = 652800.

The previous prime is 1305823. The next prime is 1305869. The reversal of 1305856 is 6585031.

It can be written as a sum of positive squares in only one way, i.e., 665856 + 640000 = 816^2 + 800^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2295 + ... + 2806.

2^1305856 is an apocalyptic number.

1305856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1305856 is a deficient number, since it is larger than the sum of its proper divisors (1301266).

1305856 is an frugal number, since it uses more digits than its factorization.

1305856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5117 (or 5103 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1305856 is about 1142.7405654828. The cubic root of 1305856 is about 109.3029196917.

The spelling of 1305856 in words is "one million, three hundred five thousand, eight hundred fifty-six".