18639429 has 8 divisors (see below), whose sum is σ = 26314560. Its totient is φ = 11695296.

The previous prime is 18639421. The next prime is 18639433. The reversal of 18639429 is 92493681.

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

It is not a de Polignac number, because 18639429 - 2³ = 18639421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182689 + ... + 182790.

It is an arithmetic number, because the mean of its divisors is an integer number (3289320).

Almost surely, 2^18639429 is an apocalyptic number.

It is an amenable number.

18639429 is a deficient number, since it is larger than the sum of its proper divisors (7675131).

18639429 is a wasteful number, since it uses less digits than its factorization.

18639429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365499.

The product of its digits is 93312, while the sum is 42.

The square root of 18639429 is about 4317.3405008176. The cubic root of 18639429 is about 265.1413936319.

The spelling of 18639429 in words is "eighteen million, six hundred thirty-nine thousand, four hundred twenty-nine".