12073721 has 16 divisors (see below), whose sum is σ = 14212800. Its totient is φ = 10137600.

The previous prime is 12073717. The next prime is 12073739. The reversal of 12073721 is 12737021.

12073721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12073721 - 2² = 12073717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12073741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7865 + ... + 9273.

It is an arithmetic number, because the mean of its divisors is an integer number (888300).

Almost surely, 2^12073721 is an apocalyptic number.

12073721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12073721 is a deficient number, since it is larger than the sum of its proper divisors (2139079).

12073721 is a wasteful number, since it uses less digits than its factorization.

12073721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 12073721 is about 3474.7260323657. The cubic root of 12073721 is about 229.4107221376.

The spelling of 12073721 in words is "twelve million, seventy-three thousand, seven hundred twenty-one".