13955821 has 8 divisors (see below), whose sum is σ = 15257088. Its totient is φ = 12660000.

The previous prime is 13955813. The next prime is 13955857. The reversal of 13955821 is 12855931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13955821 - 2³ = 13955813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13955881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5556 + ... + 7666.

It is an arithmetic number, because the mean of its divisors is an integer number (1907136).

Almost surely, 2^13955821 is an apocalyptic number.

13955821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13955821 is a deficient number, since it is larger than the sum of its proper divisors (1301267).

13955821 is a wasteful number, since it uses less digits than its factorization.

13955821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723.

The product of its digits is 10800, while the sum is 34.

The square root of 13955821 is about 3735.7490547412. The cubic root of 13955821 is about 240.7604410040.

The spelling of 13955821 in words is "thirteen million, nine hundred fifty-five thousand, eight hundred twenty-one".