12072391 has 4 divisors (see below), whose sum is σ = 12707800. Its totient is φ = 11436984.

The previous prime is 12072383. The next prime is 12072407. The reversal of 12072391 is 19327021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12072391 - 2³ = 12072383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12072301) 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, 317676 + ... + 317713.

It is an arithmetic number, because the mean of its divisors is an integer number (3176950).

Almost surely, 2^12072391 is an apocalyptic number.

12072391 is a deficient number, since it is larger than the sum of its proper divisors (635409).

12072391 is an equidigital number, since it uses as much as digits as its factorization.

12072391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635408.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 12072391 is about 3474.5346451000. The cubic root of 12072391 is about 229.4022981269.

The spelling of 12072391 in words is "twelve million, seventy-two thousand, three hundred ninety-one".