18723938 has 8 divisors (see below), whose sum is σ = 28992000. Its totient is φ = 9059940.

The previous prime is 18723931. The next prime is 18723941. The reversal of 18723938 is 83932781.

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 = 18723895 and 18723904.

It is not an unprimeable number, because it can be changed into a prime (18723931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150938 + ... + 151061.

It is an arithmetic number, because the mean of its divisors is an integer number (3624000).

Almost surely, 2^18723938 is an apocalyptic number.

18723938 is a deficient number, since it is larger than the sum of its proper divisors (10268062).

18723938 is a wasteful number, since it uses less digits than its factorization.

18723938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302032.

The product of its digits is 72576, while the sum is 41.

The square root of 18723938 is about 4327.1165919120. The cubic root of 18723938 is about 265.5414962987.

The spelling of 18723938 in words is "eighteen million, seven hundred twenty-three thousand, nine hundred thirty-eight".