12124391 has 4 divisors (see below), whose sum is σ = 12270552. Its totient is φ = 11978232.

The previous prime is 12124369. The next prime is 12124423. The reversal of 12124391 is 19342121.

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 12124391 - 2⁶ = 12124327 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 (12124361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72956 + ... + 73121.

It is an arithmetic number, because the mean of its divisors is an integer number (3067638).

Almost surely, 2^12124391 is an apocalyptic number.

12124391 is a deficient number, since it is larger than the sum of its proper divisors (146161).

12124391 is an equidigital number, since it uses as much as digits as its factorization.

12124391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146160.

The product of its digits is 432, while the sum is 23.

The square root of 12124391 is about 3482.0096208942. The cubic root of 12124391 is about 229.7311982603.

The spelling of 12124391 in words is "twelve million, one hundred twenty-four thousand, three hundred ninety-one".