13978828 has 24 divisors (see below), whose sum is σ = 26024544. Its totient is φ = 6547200.

The previous prime is 13978823. The next prime is 13978829. The reversal of 13978828 is 82887931.

13978828 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

13978828 is a nontrivial binomial coefficient, being equal to C(5288, 2).

It is not an unprimeable number, because it can be changed into a prime (13978823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20818 + ... + 21478.

It is an arithmetic number, because the mean of its divisors is an integer number (1084356).

Almost surely, 2^13978828 is an apocalyptic number.

13978828 is the 5287-th triangular number and also the 2644-th hexagonal number.

13978828 is the 1763-rd centered nonagonal number.

It is an amenable number.

13978828 is a deficient number, since it is larger than the sum of its proper divisors (12045716).

13978828 is a wasteful number, since it uses less digits than its factorization.

13978828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993 (or 991 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The square root of 13978828 is about 3738.8270888074. The cubic root of 13978828 is about 240.8926709976.

The spelling of 13978828 in words is "thirteen million, nine hundred seventy-eight thousand, eight hundred twenty-eight".