12391738 has 16 divisors (see below), whose sum is σ = 19096704. Its totient is φ = 6027840.

The previous prime is 12391727. The next prime is 12391739. The reversal of 12391738 is 83719321.

It is not an unprimeable number, because it can be changed into a prime (12391739) 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 7 ways as a sum of consecutive naturals, for example, 22381 + ... + 22927.

It is an arithmetic number, because the mean of its divisors is an integer number (1193544).

Almost surely, 2^12391738 is an apocalyptic number.

12391738 is a deficient number, since it is larger than the sum of its proper divisors (6704966).

12391738 is a wasteful number, since it uses less digits than its factorization.

12391738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837.

The product of its digits is 9072, while the sum is 34.

The square root of 12391738 is about 3520.1900516876. The cubic root of 12391738 is about 231.4074877549.

The spelling of 12391738 in words is "twelve million, three hundred ninety-one thousand, seven hundred thirty-eight".