12539699 has 4 divisors (see below), whose sum is σ = 12562536. Its totient is φ = 12516864.

The previous prime is 12539663. The next prime is 12539701. The reversal of 12539699 is 99693521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99693521 = 67 ⋅1487963.

It is a cyclic number.

It is not a de Polignac number, because 12539699 - 2¹² = 12535603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12532699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10574 + ... + 11699.

It is an arithmetic number, because the mean of its divisors is an integer number (3140634).

Almost surely, 2^12539699 is an apocalyptic number.

12539699 is a deficient number, since it is larger than the sum of its proper divisors (22837).

12539699 is an equidigital number, since it uses as much as digits as its factorization.

12539699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22836.

The product of its digits is 131220, while the sum is 44.

The square root of 12539699 is about 3541.1437417874. The cubic root of 12539699 is about 232.3248706230.

The spelling of 12539699 in words is "twelve million, five hundred thirty-nine thousand, six hundred ninety-nine".