12380721 has 4 divisors (see below), whose sum is σ = 16507632. Its totient is φ = 8253812.

The previous prime is 12380717. The next prime is 12380759. The reversal of 12380721 is 12708321.

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.

It is a cyclic number.

It is not a de Polignac number, because 12380721 - 2² = 12380717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12380691 and 12380700.

It is not an unprimeable number, because it can be changed into a prime (12380791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063451 + ... + 2063456.

It is an arithmetic number, because the mean of its divisors is an integer number (4126908).

Almost surely, 2^12380721 is an apocalyptic number.

It is an amenable number.

12380721 is a deficient number, since it is larger than the sum of its proper divisors (4126911).

12380721 is an equidigital number, since it uses as much as digits as its factorization.

12380721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4126910.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12380721 is about 3518.6248734413. The cubic root of 12380721 is about 231.3388890323.

The spelling of 12380721 in words is "twelve million, three hundred eighty thousand, seven hundred twenty-one".