13978904 has 8 divisors (see below), whose sum is σ = 26210460. Its totient is φ = 6989448.

The previous prime is 13978901. The next prime is 13978931. The reversal of 13978904 is 40987931.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978901) 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 as a sum of consecutive naturals, namely, 873674 + ... + 873689.

Almost surely, 2^13978904 is an apocalyptic number.

It is an amenable number.

13978904 is a deficient number, since it is larger than the sum of its proper divisors (12231556).

13978904 is a wasteful number, since it uses less digits than its factorization.

13978904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747369 (or 1747365 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 13978904 is about 3738.8372524088. The cubic root of 13978904 is about 240.8931075580.

It can be divided in two parts, 1397 and 8904, that added together give a palindrome (10301).

The spelling of 13978904 in words is "thirteen million, nine hundred seventy-eight thousand, nine hundred four".