12372721 has 4 divisors (see below), whose sum is σ = 12470272. Its totient is φ = 12275172.

The previous prime is 12372707. The next prime is 12372739. The reversal of 12372721 is 12727321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12727321 = 19 ⋅669859.

It is a cyclic number.

It is not a de Polignac number, because 12372721 - 2¹⁹ = 11848433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12372761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48585 + ... + 48838.

It is an arithmetic number, because the mean of its divisors is an integer number (3117568).

Almost surely, 2^12372721 is an apocalyptic number.

It is an amenable number.

12372721 is a deficient number, since it is larger than the sum of its proper divisors (97551).

12372721 is an equidigital number, since it uses as much as digits as its factorization.

12372721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97550.

The product of its digits is 1176, while the sum is 25.

The square root of 12372721 is about 3517.4878819976. The cubic root of 12372721 is about 231.2890505273.

The spelling of 12372721 in words is "twelve million, three hundred seventy-two thousand, seven hundred twenty-one".