13281856 has 56 divisors (see below), whose sum is σ = 31455360. Its totient is φ = 5440512.

The previous prime is 13281823. The next prime is 13281889. The reversal of 13281856 is 65818231.

It is an interprime number because it is at equal distance from previous prime (13281823) and next prime (13281889).

It is a tau number, because it is divible by the number of its divisors (56).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9660 + ... + 10948.

Almost surely, 2^13281856 is an apocalyptic number.

13281856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13281856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15727680).

13281856 is an abundant number, since it is smaller than the sum of its proper divisors (18173504).

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

13281856 is a wasteful number, since it uses less digits than its factorization.

13281856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331 (or 1321 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 13281856 is about 3644.4280758440. The cubic root of 13281856 is about 236.8206610899.

Subtracting 13281856 from its reverse (65818231), we obtain a triangular number (52536375 = T₁₀₂₅₀).

The spelling of 13281856 in words is "thirteen million, two hundred eighty-one thousand, eight hundred fifty-six".