13921550 has 24 divisors (see below), whose sum is σ = 26529552. Its totient is φ = 5432000.

The previous prime is 13921549. The next prime is 13921559. The reversal of 13921550 is 5512931.

13921550 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 not an unprimeable number, because it can be changed into a prime (13921559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1346 + ... + 5445.

It is an arithmetic number, because the mean of its divisors is an integer number (1105398).

Almost surely, 2^13921550 is an apocalyptic number.

13921550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13921550 is a deficient number, since it is larger than the sum of its proper divisors (12608002).

13921550 is a wasteful number, since it uses less digits than its factorization.

13921550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6844 (or 6839 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 13921550 is about 3731.1593372570. The cubic root of 13921550 is about 240.5632027734.

The spelling of 13921550 in words is "thirteen million, nine hundred twenty-one thousand, five hundred fifty".