13978797 has 16 divisors (see below), whose sum is σ = 21417600. Its totient is φ = 7944192.

The previous prime is 13978793. The next prime is 13978817. The reversal of 13978797 is 79787931.

It is a happy number.

It is not a de Polignac number, because 13978797 - 2² = 13978793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2329 + ... + 5777.

It is an arithmetic number, because the mean of its divisors is an integer number (1338600).

Almost surely, 2^13978797 is an apocalyptic number.

It is an amenable number.

13978797 is a deficient number, since it is larger than the sum of its proper divisors (7438803).

13978797 is a wasteful number, since it uses less digits than its factorization.

13978797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652.

The product of its digits is 666792, while the sum is 51.

The square root of 13978797 is about 3738.8229431199. The cubic root of 13978797 is about 240.8924929264.

The spelling of 13978797 in words is "thirteen million, nine hundred seventy-eight thousand, seven hundred ninety-seven".