13721688 has 24 divisors (see below), whose sum is σ = 37163100. Its totient is φ = 4573872.

The previous prime is 13721681. The next prime is 13721693. The reversal of 13721688 is 88612731.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95218 + ... + 95361.

Almost surely, 2^13721688 is an apocalyptic number.

13721688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13721688 is an abundant number, since it is smaller than the sum of its proper divisors (23441412).

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

13721688 is a wasteful number, since it uses less digits than its factorization.

13721688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190591 (or 190584 counting only the distinct ones).

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

The square root of 13721688 is about 3704.2796870647. The cubic root of 13721688 is about 239.4064499532.

The spelling of 13721688 in words is "thirteen million, seven hundred twenty-one thousand, six hundred eighty-eight".