13391988 has 24 divisors (see below), whose sum is σ = 33086592. Its totient is φ = 4201344.

The previous prime is 13391981. The next prime is 13392011. The reversal of 13391988 is 88919331.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13391981) 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 7 ways as a sum of consecutive naturals, for example, 32620 + ... + 33027.

It is an arithmetic number, because the mean of its divisors is an integer number (1378608).

Almost surely, 2^13391988 is an apocalyptic number.

It is an amenable number.

13391988 is an abundant number, since it is smaller than the sum of its proper divisors (19694604).

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

13391988 is a wasteful number, since it uses less digits than its factorization.

13391988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65671 (or 65669 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 13391988 is about 3659.5065241095. The cubic root of 13391988 is about 237.4734256508.

The spelling of 13391988 in words is "thirteen million, three hundred ninety-one thousand, nine hundred eighty-eight".