12467991 has 4 divisors (see below), whose sum is σ = 16623992. Its totient is φ = 8311992.

The previous prime is 12467981. The next prime is 12468007. The reversal of 12467991 is 19976421.

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

It is not a de Polignac number, because 12467991 - 2⁹ = 12467479 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 (12467911) 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, 2077996 + ... + 2078001.

It is an arithmetic number, because the mean of its divisors is an integer number (4155998).

Almost surely, 2^12467991 is an apocalyptic number.

12467991 is a deficient number, since it is larger than the sum of its proper divisors (4156001).

12467991 is an equidigital number, since it uses as much as digits as its factorization.

12467991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156000.

The product of its digits is 27216, while the sum is 39.

The square root of 12467991 is about 3531.0042480858. The cubic root of 12467991 is about 231.8811755269.

The spelling of 12467991 in words is "twelve million, four hundred sixty-seven thousand, nine hundred ninety-one".