12499649 has 4 divisors (see below), whose sum is σ = 13043136. Its totient is φ = 11956164.

The previous prime is 12499639. The next prime is 12499651. The reversal of 12499649 is 94699421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94699421 = 5059 ⋅18719.

It is a cyclic number.

It is not a de Polignac number, because 12499649 - 2²⁰ = 11451073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12499639) 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, 271709 + ... + 271754.

It is an arithmetic number, because the mean of its divisors is an integer number (3260784).

Almost surely, 2^12499649 is an apocalyptic number.

It is an amenable number.

12499649 is a deficient number, since it is larger than the sum of its proper divisors (543487).

12499649 is an equidigital number, since it uses as much as digits as its factorization.

12499649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543486.

The product of its digits is 139968, while the sum is 44.

The square root of 12499649 is about 3535.4842666882. The cubic root of 12499649 is about 232.0772693967.

The spelling of 12499649 in words is "twelve million, four hundred ninety-nine thousand, six hundred forty-nine".