13721988 has 96 divisors (see below), whose sum is σ = 39029760. Its totient is φ = 3669120.

The previous prime is 13721987. The next prime is 13721993. The reversal of 13721988 is 88912731.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104683 + ... + 104813.

It is an arithmetic number, because the mean of its divisors is an integer number (406560).

Almost surely, 2^13721988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13721988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19514880).

13721988 is an abundant number, since it is smaller than the sum of its proper divisors (25307772).

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

13721988 is a wasteful number, since it uses less digits than its factorization.

13721988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 215 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 13721988 is about 3704.3201805460. The cubic root of 13721988 is about 239.4081946708.

The spelling of 13721988 in words is "thirteen million, seven hundred twenty-one thousand, nine hundred eighty-eight".