13811320 has 32 divisors (see below), whose sum is σ = 31183200. Its totient is φ = 5505408.

The previous prime is 13811297. The next prime is 13811321. The reversal of 13811320 is 2311831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13811321) 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, 19126 + ... + 19834.

It is an arithmetic number, because the mean of its divisors is an integer number (974475).

Almost surely, 2^13811320 is an apocalyptic number.

13811320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13811320 is an abundant number, since it is smaller than the sum of its proper divisors (17371880).

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

13811320 is a wasteful number, since it uses less digits than its factorization.

13811320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 13811320 is about 3716.3584326596. The cubic root of 13811320 is about 239.9265979232.

It can be divided in two parts, 1381 and 1320, that added together give a triangular number (2701 = T₇₃).

The spelling of 13811320 in words is "thirteen million, eight hundred eleven thousand, three hundred twenty".