12499997 has 4 divisors (see below), whose sum is σ = 12735900. Its totient is φ = 12264096.

The previous prime is 12499987. The next prime is 12499999. The reversal of 12499997 is 79999421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79999421 = 3709 ⋅21569.

It can be written as a sum of positive squares in 2 ways, for example, as 5285401 + 7214596 = 2299^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 12499997 - 2¹⁸ = 12237853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12499999) 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, 117872 + ... + 117977.

It is an arithmetic number, because the mean of its divisors is an integer number (3183975).

Almost surely, 2^12499997 is an apocalyptic number.

It is an amenable number.

12499997 is a deficient number, since it is larger than the sum of its proper divisors (235903).

12499997 is an equidigital number, since it uses as much as digits as its factorization.

12499997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235902.

The product of its digits is 367416, while the sum is 50.

The square root of 12499997 is about 3535.5334816686. The cubic root of 12499997 is about 232.0794231143.

The spelling of 12499997 in words is "twelve million, four hundred ninety-nine thousand, nine hundred ninety-seven".