13978662 has 8 divisors (see below), whose sum is σ = 27957336. Its totient is φ = 4659552.

The previous prime is 13978649. The next prime is 13978669. The reversal of 13978662 is 26687931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

13978662 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978669) 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 3 ways as a sum of consecutive naturals, for example, 1164883 + ... + 1164894.

It is an arithmetic number, because the mean of its divisors is an integer number (3494667).

Almost surely, 2^13978662 is an apocalyptic number.

13978662 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13978662 is a wasteful number, since it uses less digits than its factorization.

13978662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329782.

The product of its digits is 108864, while the sum is 42.

The square root of 13978662 is about 3738.8048892661. The cubic root of 13978662 is about 240.8917174522.

The spelling of 13978662 in words is "thirteen million, nine hundred seventy-eight thousand, six hundred sixty-two".