18904238 has 8 divisors (see below), whose sum is σ = 30024432. Its totient is φ = 8896096.

The previous prime is 18904211. The next prime is 18904253. The reversal of 18904238 is 83240981.

It is a happy number.

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 = 18904198 and 18904207.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 277970 + ... + 278037.

It is an arithmetic number, because the mean of its divisors is an integer number (3753054).

Almost surely, 2^18904238 is an apocalyptic number.

18904238 is a deficient number, since it is larger than the sum of its proper divisors (11120194).

18904238 is a wasteful number, since it uses less digits than its factorization.

18904238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556026.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 18904238 is about 4347.9004128430. The cubic root of 18904238 is about 266.3911087552.

The spelling of 18904238 in words is "eighteen million, nine hundred four thousand, two hundred thirty-eight".