13881213 has 20 divisors (see below), whose sum is σ = 21640608. Its totient is φ = 8850600.

The previous prime is 13881209. The next prime is 13881223. The reversal of 13881213 is 31218831.

It is not a de Polignac number, because 13881213 - 2² = 13881209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13881223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1863 + ... + 5588.

Almost surely, 2^13881213 is an apocalyptic number.

It is an amenable number.

13881213 is a deficient number, since it is larger than the sum of its proper divisors (7759395).

13881213 is an equidigital number, since it uses as much as digits as its factorization.

13881213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7486 (or 7477 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 13881213 is about 3725.7499916124. The cubic root of 13881213 is about 240.3306380345.

It can be divided in two parts, 1388 and 1213, that added together give a square (2601 = 51²).

The spelling of 13881213 in words is "thirteen million, eight hundred eighty-one thousand, two hundred thirteen".