13780005 has 16 divisors (see below), whose sum is σ = 22184064. Its totient is φ = 7304000.

The previous prime is 13780003. The next prime is 13780009. The reversal of 13780005 is 50008731.

It is not a de Polignac number, because 13780005 - 2¹ = 13780003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13780003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246 + ... + 5255.

It is an arithmetic number, because the mean of its divisors is an integer number (1386504).

Almost surely, 2^13780005 is an apocalyptic number.

13780005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13780005 is a deficient number, since it is larger than the sum of its proper divisors (8404059).

13780005 is a wasteful number, since it uses less digits than its factorization.

13780005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5676.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 13780005 is about 3712.1429121196. The cubic root of 13780005 is about 239.7451287374.

Adding to 13780005 its reverse (50008731), we get a palindrome (63788736).

The spelling of 13780005 in words is "thirteen million, seven hundred eighty thousand, five".