13780785 has 16 divisors (see below), whose sum is σ = 22149504. Its totient is φ = 7316352.

The previous prime is 13780783. The next prime is 13780787. The reversal of 13780785 is 58708731.

13780785 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13780783) and next prime (13780787).

It is not a de Polignac number, because 13780785 - 2¹ = 13780783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13780783) 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 15 ways as a sum of consecutive naturals, for example, 1524 + ... + 5466.

It is an arithmetic number, because the mean of its divisors is an integer number (1384344).

Almost surely, 2^13780785 is an apocalyptic number.

13780785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13780785 is a deficient number, since it is larger than the sum of its proper divisors (8368719).

13780785 is a wasteful number, since it uses less digits than its factorization.

13780785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 13780785 is about 3712.2479712433. The cubic root of 13780785 is about 239.7496521434.

The spelling of 13780785 in words is "thirteen million, seven hundred eighty thousand, seven hundred eighty-five".