1229991423 has 8 divisors (see below), whose sum is σ = 1641381936. Its totient is φ = 819297600.

The previous prime is 1229991409. The next prime is 1229991443. The reversal of 1229991423 is 3241999221.

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

It is not a de Polignac number, because 1229991423 - 2¹² = 1229987327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229991403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170038 + ... + 177123.

It is an arithmetic number, because the mean of its divisors is an integer number (205172742).

Almost surely, 2^1229991423 is an apocalyptic number.

1229991423 is a deficient number, since it is larger than the sum of its proper divisors (411390513).

1229991423 is a wasteful number, since it uses less digits than its factorization.

1229991423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348345.

The product of its digits is 69984, while the sum is 42.

The square root of 1229991423 is about 35071.2335540112. The cubic root of 1229991423 is about 1071.4387792374.

The spelling of 1229991423 in words is "one billion, two hundred twenty-nine million, nine hundred ninety-one thousand, four hundred twenty-three".