13778105 has 16 divisors (see below), whose sum is σ = 18620928. Its totient is φ = 9696000.

The previous prime is 13778101. The next prime is 13778113. The reversal of 13778105 is 50187731.

It is not a de Polignac number, because 13778105 - 2² = 13778101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13778101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2336 + ... + 5745.

It is an arithmetic number, because the mean of its divisors is an integer number (1163808).

Almost surely, 2^13778105 is an apocalyptic number.

It is an amenable number.

13778105 is a deficient number, since it is larger than the sum of its proper divisors (4842823).

13778105 is a wasteful number, since it uses less digits than its factorization.

13778105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8128.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 13778105 is about 3711.8869864262. The cubic root of 13778105 is about 239.7341094699.

The spelling of 13778105 in words is "thirteen million, seven hundred seventy-eight thousand, one hundred five".