12539391 has 8 divisors (see below), whose sum is σ = 16920960. Its totient is φ = 8258712.

The previous prime is 12539389. The next prime is 12539467. The reversal of 12539391 is 19393521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12539391 - 2¹ = 12539389 is a prime.

It is a super-3 number, since 3×12539391³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12539311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24931 + ... + 25428.

It is an arithmetic number, because the mean of its divisors is an integer number (2115120).

Almost surely, 2^12539391 is an apocalyptic number.

12539391 is a deficient number, since it is larger than the sum of its proper divisors (4381569).

12539391 is an equidigital number, since it uses as much as digits as its factorization.

12539391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50445.

The product of its digits is 7290, while the sum is 33.

The square root of 12539391 is about 3541.1002527463. The cubic root of 12539391 is about 232.3229684868.

The spelling of 12539391 in words is "twelve million, five hundred thirty-nine thousand, three hundred ninety-one".