12929991 has 8 divisors (see below), whose sum is σ = 17259264. Its totient is φ = 8610360.

The previous prime is 12929981. The next prime is 12929999. The reversal of 12929991 is 19992921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12929991 - 2⁷ = 12929863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12929999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1746 + ... + 5376.

It is an arithmetic number, because the mean of its divisors is an integer number (2157408).

Almost surely, 2^12929991 is an apocalyptic number.

12929991 is a deficient number, since it is larger than the sum of its proper divisors (4329273).

12929991 is a wasteful number, since it uses less digits than its factorization.

12929991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4821.

The product of its digits is 26244, while the sum is 42.

The square root of 12929991 is about 3595.8296678235. The cubic root of 12929991 is about 234.7106201118.

The spelling of 12929991 in words is "twelve million, nine hundred twenty-nine thousand, nine hundred ninety-one".