13811388 has 12 divisors (see below), whose sum is σ = 32226600. Its totient is φ = 4603792.

The previous prime is 13811387. The next prime is 13811407. The reversal of 13811388 is 88311831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13811387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575463 + ... + 575486.

It is an arithmetic number, because the mean of its divisors is an integer number (2685550).

Almost surely, 2^13811388 is an apocalyptic number.

It is an amenable number.

13811388 is an abundant number, since it is smaller than the sum of its proper divisors (18415212).

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

13811388 is a wasteful number, since it uses less digits than its factorization.

13811388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150956 (or 1150954 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 13811388 is about 3716.3675813891. The cubic root of 13811388 is about 239.9269916819.

The spelling of 13811388 in words is "thirteen million, eight hundred eleven thousand, three hundred eighty-eight".