13921620 has 48 divisors (see below), whose sum is σ = 40040448. Its totient is φ = 3611520.

The previous prime is 13921571. The next prime is 13921643. The reversal of 13921620 is 2612931.

13921620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 916 + ... + 5355.

It is an arithmetic number, because the mean of its divisors is an integer number (834176).

Almost surely, 2^13921620 is an apocalyptic number.

13921620 is a gapful number since it is divisible by the number (10) 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 13921620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20020224).

13921620 is an abundant number, since it is smaller than the sum of its proper divisors (26118828).

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

13921620 is a wasteful number, since it uses less digits than its factorization.

13921620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6320 (or 6318 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 13921620 is about 3731.1687177076. The cubic root of 13921620 is about 240.5636059708.

It can be divided in two parts, 13921 and 620, that added together give a palindrome (14541).

The spelling of 13921620 in words is "thirteen million, nine hundred twenty-one thousand, six hundred twenty".