18397438 has 8 divisors (see below), whose sum is σ = 28269360. Its totient is φ = 8974320.

The previous prime is 18397429. The next prime is 18397459. The reversal of 18397438 is 83479381.

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 = 18397394 and 18397403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112098 + ... + 112261.

It is an arithmetic number, because the mean of its divisors is an integer number (3533670).

Almost surely, 2^18397438 is an apocalyptic number.

18397438 is a deficient number, since it is larger than the sum of its proper divisors (9871922).

18397438 is a wasteful number, since it uses less digits than its factorization.

18397438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224402.

The product of its digits is 145152, while the sum is 43.

The square root of 18397438 is about 4289.2234728445. The cubic root of 18397438 is about 263.9889706901.

The spelling of 18397438 in words is "eighteen million, three hundred ninety-seven thousand, four hundred thirty-eight".