13788945 has 12 divisors (see below), whose sum is σ = 23900916. Its totient is φ = 7354080.

The previous prime is 13788941. The next prime is 13788947. The reversal of 13788945 is 54988731.

It can be written as a sum of positive squares in 2 ways, for example, as 4498641 + 9290304 = 2121^2 + 3048^2 .

It is not a de Polignac number, because 13788945 - 2² = 13788941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 306421 = 13788945 / (1 + 3 + 7 + 8 + 8 + 9 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 13788945.

It is not an unprimeable number, because it can be changed into a prime (13788941) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 153166 + ... + 153255.

It is an arithmetic number, because the mean of its divisors is an integer number (1991743).

Almost surely, 2^13788945 is an apocalyptic number.

13788945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13788945 is a deficient number, since it is larger than the sum of its proper divisors (10111971).

13788945 is a wasteful number, since it uses less digits than its factorization.

13788945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306432 (or 306429 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 13788945 is about 3713.3468731052. The cubic root of 13788945 is about 239.7969636995.

The spelling of 13788945 in words is "thirteen million, seven hundred eighty-eight thousand, nine hundred forty-five".