13439988 has 36 divisors (see below), whose sum is σ = 35072128. Its totient is φ = 4335120.

The previous prime is 13439939. The next prime is 13440001. The reversal of 13439988 is 88993431.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4906 + ... + 7137.

Almost surely, 2^13439988 is an apocalyptic number.

13439988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13439988 is an abundant number, since it is smaller than the sum of its proper divisors (21632140).

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

13439988 is a wasteful number, since it uses less digits than its factorization.

13439988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12084 (or 12079 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 13439988 is about 3666.0589193301. The cubic root of 13439988 is about 237.7568073495.

The spelling of 13439988 in words is "thirteen million, four hundred thirty-nine thousand, nine hundred eighty-eight".