13721886 has 40 divisors (see below), whose sum is σ = 31206384. Its totient is φ = 4505760.

The previous prime is 13721881. The next prime is 13721891. The reversal of 13721886 is 68812731.

It is an interprime number because it is at equal distance from previous prime (13721881) and next prime (13721891).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 13721886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721881) 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 19 ways as a sum of consecutive naturals, for example, 10906 + ... + 12098.

Almost surely, 2^13721886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13721886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15603192).

13721886 is an abundant number, since it is smaller than the sum of its proper divisors (17484498).

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

13721886 is a wasteful number, since it uses less digits than its factorization.

13721886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278 (or 1269 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 13721886 is about 3704.3064128120. The cubic root of 13721886 is about 239.4076014697.

The spelling of 13721886 in words is "thirteen million, seven hundred twenty-one thousand, eight hundred eighty-six".