18208738 has 8 divisors (see below), whose sum is σ = 27522000. Its totient is φ = 9034740.

The previous prime is 18208727. The next prime is 18208747. The reversal of 18208738 is 83780281.

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 = 18208697 and 18208706.

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, 34488 + ... + 35011.

It is an arithmetic number, because the mean of its divisors is an integer number (3440250).

Almost surely, 2^18208738 is an apocalyptic number.

18208738 is a deficient number, since it is larger than the sum of its proper divisors (9313262).

18208738 is a wasteful number, since it uses less digits than its factorization.

18208738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69632.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 18208738 is about 4267.1697880445. The cubic root of 18208738 is about 263.0833009225.

The spelling of 18208738 in words is "eighteen million, two hundred eight thousand, seven hundred thirty-eight".