18906842 has 8 divisors (see below), whose sum is σ = 29019936. Its totient is φ = 9233532.

The previous prime is 18906841. The next prime is 18906847. The reversal of 18906842 is 24860981.

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

It is a junction number, because it is equal to n+sod(n) for n = 18906796 and 18906805.

It is not an unprimeable number, because it can be changed into a prime (18906841) 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, 109838 + ... + 110009.

It is an arithmetic number, because the mean of its divisors is an integer number (3627492).

Almost surely, 2^18906842 is an apocalyptic number.

18906842 is a deficient number, since it is larger than the sum of its proper divisors (10113094).

18906842 is a wasteful number, since it uses less digits than its factorization.

18906842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219892.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 18906842 is about 4348.1998574123. The cubic root of 18906842 is about 266.4033397093.

The spelling of 18906842 in words is "eighteen million, nine hundred six thousand, eight hundred forty-two".