12391534 has 16 divisors (see below), whose sum is σ = 19900800. Its totient is φ = 5769144.

The previous prime is 12391501. The next prime is 12391541. The reversal of 12391534 is 43519321.

It is a super-2 number, since 2×12391534² = 307100229746312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 522 + ... + 5005.

It is an arithmetic number, because the mean of its divisors is an integer number (1243800).

Almost surely, 2^12391534 is an apocalyptic number.

12391534 is a deficient number, since it is larger than the sum of its proper divisors (7509266).

12391534 is a wasteful number, since it uses less digits than its factorization.

12391534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5607.

The product of its digits is 3240, while the sum is 28.

The square root of 12391534 is about 3520.1610758600. The cubic root of 12391534 is about 231.4062178931.

The spelling of 12391534 in words is "twelve million, three hundred ninety-one thousand, five hundred thirty-four".