12499945 has 4 divisors (see below), whose sum is σ = 14999940. Its totient is φ = 9999952.

The previous prime is 12499919. The next prime is 12499987. The reversal of 12499945 is 54999421.

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 1669264 + 10830681 = 1292^2 + 3291^2 .

It is a cyclic number.

It is not a de Polignac number, because 12499945 - 2¹⁹ = 11975657 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1249990 + ... + 1249999.

It is an arithmetic number, because the mean of its divisors is an integer number (3749985).

Almost surely, 2^12499945 is an apocalyptic number.

It is an amenable number.

12499945 is a deficient number, since it is larger than the sum of its proper divisors (2499995).

12499945 is an equidigital number, since it uses as much as digits as its factorization.

12499945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499994.

The product of its digits is 116640, while the sum is 43.

The square root of 12499945 is about 3535.5261277496. The cubic root of 12499945 is about 232.0791012970.

The spelling of 12499945 in words is "twelve million, four hundred ninety-nine thousand, nine hundred forty-five".