13978365 has 32 divisors (see below), whose sum is σ = 24109056. Its totient is φ = 6895680.

The previous prime is 13978337. The next prime is 13978421. The reversal of 13978365 is 56387931.

It is not a de Polignac number, because 13978365 - 2⁸ = 13978109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10042 + ... + 11348.

It is an arithmetic number, because the mean of its divisors is an integer number (753408).

Almost surely, 2^13978365 is an apocalyptic number.

13978365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13978365 is a deficient number, since it is larger than the sum of its proper divisors (10130691).

13978365 is a wasteful number, since it uses less digits than its factorization.

13978365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369.

The product of its digits is 136080, while the sum is 42.

The square root of 13978365 is about 3738.7651704808. The cubic root of 13978365 is about 240.8900113912.

The spelling of 13978365 in words is "thirteen million, nine hundred seventy-eight thousand, three hundred sixty-five".