18806138 has 32 divisors (see below), whose sum is σ = 31658256. Its totient is φ = 8322048.

The previous prime is 18806107. The next prime is 18806141. The reversal of 18806138 is 83160881.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8392609 + 10413529 = 2897^2 + 3227^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18806098 and 18806107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108620 + ... + 108792.

Almost surely, 2^18806138 is an apocalyptic number.

18806138 is a deficient number, since it is larger than the sum of its proper divisors (12852118).

18806138 is a wasteful number, since it uses less digits than its factorization.

18806138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18806138 is about 4336.6044320413. The cubic root of 18806138 is about 265.9295138016.

The spelling of 18806138 in words is "eighteen million, eight hundred six thousand, one hundred thirty-eight".