13978785 has 32 divisors (see below), whose sum is σ = 23310720. Its totient is φ = 7147008.

The previous prime is 13978759. The next prime is 13978793. The reversal of 13978785 is 58787931.

It is not a de Polignac number, because 13978785 - 2⁵ = 13978753 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 49254 + ... + 49536.

It is an arithmetic number, because the mean of its divisors is an integer number (728460).

Almost surely, 2^13978785 is an apocalyptic number.

13978785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13978785 is a deficient number, since it is larger than the sum of its proper divisors (9331935).

13978785 is a wasteful number, since it uses less digits than its factorization.

13978785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417.

The product of its digits is 423360, while the sum is 48.

The square root of 13978785 is about 3738.8213383365. The cubic root of 13978785 is about 240.8924239956.

The spelling of 13978785 in words is "thirteen million, nine hundred seventy-eight thousand, seven hundred eighty-five".