12991429 has 4 divisors (see below), whose sum is σ = 14172480. Its totient is φ = 11810380.

The previous prime is 12991427. The next prime is 12991439. The reversal of 12991429 is 92419921.

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.

It is a cyclic number.

It is not a de Polignac number, because 12991429 - 2¹ = 12991427 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 (12991423) 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 3 ways as a sum of consecutive naturals, for example, 590509 + ... + 590530.

It is an arithmetic number, because the mean of its divisors is an integer number (3543120).

Almost surely, 2^12991429 is an apocalyptic number.

It is an amenable number.

12991429 is a deficient number, since it is larger than the sum of its proper divisors (1181051).

12991429 is a wasteful number, since it uses less digits than its factorization.

12991429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181050.

The product of its digits is 11664, while the sum is 37.

The square root of 12991429 is about 3604.3624956433. The cubic root of 12991429 is about 235.0817823098.

The spelling of 12991429 in words is "twelve million, nine hundred ninety-one thousand, four hundred twenty-nine".