18923429 has 4 divisors (see below), whose sum is σ = 21626784. Its totient is φ = 16220076.

The previous prime is 18923407. The next prime is 18923441. The reversal of 18923429 is 92432981.

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 18923429 - 2²⁴ = 2146213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18923392 and 18923401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18923459) 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, 1351667 + ... + 1351680.

It is an arithmetic number, because the mean of its divisors is an integer number (5406696).

Almost surely, 2^18923429 is an apocalyptic number.

It is an amenable number.

18923429 is a deficient number, since it is larger than the sum of its proper divisors (2703355).

18923429 is an equidigital number, since it uses as much as digits as its factorization.

18923429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703354.

The product of its digits is 31104, while the sum is 38.

The square root of 18923429 is about 4350.1067802986. The cubic root of 18923429 is about 266.4812222841.

The spelling of 18923429 in words is "eighteen million, nine hundred twenty-three thousand, four hundred twenty-nine".