13921775 has 48 divisors (see below), whose sum is σ = 21427200. Its totient is φ = 8760960.

The previous prime is 13921771. The next prime is 13921777. The reversal of 13921775 is 57712931.

It is a happy number.

It is not a de Polignac number, because 13921775 - 2² = 13921771 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13921771) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 176186 + ... + 176264.

It is an arithmetic number, because the mean of its divisors is an integer number (446400).

Almost surely, 2^13921775 is an apocalyptic number.

13921775 is a deficient number, since it is larger than the sum of its proper divisors (7505425).

13921775 is a wasteful number, since it uses less digits than its factorization.

13921775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 163 counting only the distinct ones).

The product of its digits is 13230, while the sum is 35.

The square root of 13921775 is about 3731.1894886216. The cubic root of 13921775 is about 240.5644987601.

The spelling of 13921775 in words is "thirteen million, nine hundred twenty-one thousand, seven hundred seventy-five".