12449991 has 4 divisors (see below), whose sum is σ = 16599992. Its totient is φ = 8299992.

The previous prime is 12449981. The next prime is 12449999. The reversal of 12449991 is 19994421.

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

It is not a de Polignac number, because 12449991 - 2¹⁰ = 12448967 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 (12449999) 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, 2074996 + ... + 2075001.

It is an arithmetic number, because the mean of its divisors is an integer number (4149998).

Almost surely, 2^12449991 is an apocalyptic number.

12449991 is a deficient number, since it is larger than the sum of its proper divisors (4150001).

12449991 is an equidigital number, since it uses as much as digits as its factorization.

12449991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150000.

The product of its digits is 23328, while the sum is 39.

The square root of 12449991 is about 3528.4544775298. The cubic root of 12449991 is about 231.7695330720.

The spelling of 12449991 in words is "twelve million, four hundred forty-nine thousand, nine hundred ninety-one".