13989428 has 24 divisors (see below), whose sum is σ = 25908288. Its totient is φ = 6595776.

The previous prime is 13989427. The next prime is 13989433. The reversal of 13989428 is 82498931.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13989421) 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 7 ways as a sum of consecutive naturals, for example, 5675 + ... + 7757.

It is an arithmetic number, because the mean of its divisors is an integer number (1079512).

Almost surely, 2^13989428 is an apocalyptic number.

It is an amenable number.

13989428 is a deficient number, since it is larger than the sum of its proper divisors (11918860).

13989428 is a wasteful number, since it uses less digits than its factorization.

13989428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183 (or 2181 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 13989428 is about 3740.2443770428. The cubic root of 13989428 is about 240.9535444166.

The spelling of 13989428 in words is "thirteen million, nine hundred eighty-nine thousand, four hundred twenty-eight".