13621856 has 24 divisors (see below), whose sum is σ = 26989200. Its totient is φ = 6767488.

The previous prime is 13621831. The next prime is 13621871. The reversal of 13621856 is 65812631.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4070 + ... + 6618.

It is an arithmetic number, because the mean of its divisors is an integer number (1124550).

Almost surely, 2^13621856 is an apocalyptic number.

13621856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13621856 is a deficient number, since it is larger than the sum of its proper divisors (13367344).

13621856 is a wasteful number, since it uses less digits than its factorization.

13621856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726 (or 2718 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 13621856 is about 3690.7798633893. The cubic root of 13621856 is about 238.8244364632.

The spelling of 13621856 in words is "thirteen million, six hundred twenty-one thousand, eight hundred fifty-six".