13651920 has 120 divisors (see below), whose sum is σ = 46696416. Its totient is φ = 3573504.

The previous prime is 13651909. The next prime is 13651943. The reversal of 13651920 is 2915631.

13651920 is a `hidden beast` number, since 1 + 3 + 651 + 9 + 2 + 0 = 666.

It is a Cunningham number, because it is equal to 239³+1.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48099 + ... + 48381.

Almost surely, 2^13651920 is an apocalyptic number.

13651920 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 13651920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23348208).

13651920 is an abundant number, since it is smaller than the sum of its proper divisors (33044496).

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

13651920 is a wasteful number, since it uses less digits than its factorization.

13651920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 13651920 is about 3694.8504705874. The cubic root of 13651920 is about 239.0000058356. Note that the first 5 decimals are identical.

It can be divided in two parts, 1 and 3651920, that added together give a square (3651921 = 1911²).

The spelling of 13651920 in words is "thirteen million, six hundred fifty-one thousand, nine hundred twenty".