18397238 has 8 divisors (see below), whose sum is σ = 27849360. Its totient is φ = 9114120.

The previous prime is 18397237. The next prime is 18397261. The reversal of 18397238 is 83279381.

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 = 18397195 and 18397204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397231) 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 3 ways as a sum of consecutive naturals, for example, 41978 + ... + 42413.

It is an arithmetic number, because the mean of its divisors is an integer number (3481170).

Almost surely, 2^18397238 is an apocalyptic number.

18397238 is a deficient number, since it is larger than the sum of its proper divisors (9452122).

18397238 is a wasteful number, since it uses less digits than its factorization.

18397238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84502.

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

The square root of 18397238 is about 4289.2001585377. The cubic root of 18397238 is about 263.9880140717.

The spelling of 18397238 in words is "eighteen million, three hundred ninety-seven thousand, two hundred thirty-eight".