13721992 has 32 divisors (see below), whose sum is σ = 27453600. Its totient is φ = 6407424.

The previous prime is 13721987. The next prime is 13721993. The reversal of 13721992 is 29912731.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (13721993) 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, 21859 + ... + 22477.

It is an arithmetic number, because the mean of its divisors is an integer number (857925).

Almost surely, 2^13721992 is an apocalyptic number.

It is an amenable number.

13721992 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

13721992 is a wasteful number, since it uses less digits than its factorization.

13721992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 801 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 13721992 is about 3704.3207204560. The cubic root of 13721992 is about 239.4082179335.

It can be divided in two parts, 1372 and 1992, that added together give a square (3364 = 58²).

The spelling of 13721992 in words is "thirteen million, seven hundred twenty-one thousand, nine hundred ninety-two".