18618398 has 8 divisors (see below), whose sum is σ = 28577208. Its totient is φ = 9092664.

The previous prime is 18618389. The next prime is 18618409. The reversal of 18618398 is 89381681.

It is a happy number.

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

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, 108161 + ... + 108332.

It is an arithmetic number, because the mean of its divisors is an integer number (3572151).

Almost surely, 2^18618398 is an apocalyptic number.

18618398 is a deficient number, since it is larger than the sum of its proper divisors (9958810).

18618398 is a wasteful number, since it uses less digits than its factorization.

18618398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216538.

The product of its digits is 82944, while the sum is 44.

The square root of 18618398 is about 4314.9041704307. The cubic root of 18618398 is about 265.0416357981.

The spelling of 18618398 in words is "eighteen million, six hundred eighteen thousand, three hundred ninety-eight".