18730738 has 8 divisors (see below), whose sum is σ = 30257388. Its totient is φ = 8644944.

The previous prime is 18730729. The next prime is 18730759. The reversal of 18730738 is 83703781.

It can be written as a sum of positive squares in 2 ways, for example, as 18636489 + 94249 = 4317^2 + 307^2 .

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 = 18730697 and 18730706.

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, 360181 + ... + 360232.

Almost surely, 2^18730738 is an apocalyptic number.

18730738 is a deficient number, since it is larger than the sum of its proper divisors (11526650).

18730738 is a wasteful number, since it uses less digits than its factorization.

18730738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720428.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 18730738 is about 4327.9022632218. The cubic root of 18730738 is about 265.5736381061.

The spelling of 18730738 in words is "eighteen million, seven hundred thirty thousand, seven hundred thirty-eight".