12538997 has 4 divisors (see below), whose sum is σ = 12556236. Its totient is φ = 12521760.

The previous prime is 12538987. The next prime is 12539003. The reversal of 12538997 is 79983521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1343281 + 11195716 = 1159^2 + 3346^2 .

It is a cyclic number.

It is not a de Polignac number, because 12538997 - 2¹² = 12534901 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 (12538957) 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, 7478 + ... + 8999.

It is an arithmetic number, because the mean of its divisors is an integer number (3139059).

Almost surely, 2^12538997 is an apocalyptic number.

It is an amenable number.

12538997 is a deficient number, since it is larger than the sum of its proper divisors (17239).

12538997 is an equidigital number, since it uses as much as digits as its factorization.

12538997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17238.

The product of its digits is 136080, while the sum is 44.

The square root of 12538997 is about 3541.0446198827. The cubic root of 12538997 is about 232.3205351892.

The spelling of 12538997 in words is "twelve million, five hundred thirty-eight thousand, nine hundred ninety-seven".