18838361 has 4 divisors (see below), whose sum is σ = 19011300. Its totient is φ = 18665424.

The previous prime is 18838331. The next prime is 18838381. The reversal of 18838361 is 16383881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16383881 = 967 ⋅16943.

It can be written as a sum of positive squares in 2 ways, for example, as 5148361 + 13690000 = 2269^2 + 3700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18838361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18838301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86306 + ... + 86523.

It is an arithmetic number, because the mean of its divisors is an integer number (4752825).

Almost surely, 2^18838361 is an apocalyptic number.

It is an amenable number.

18838361 is a deficient number, since it is larger than the sum of its proper divisors (172939).

18838361 is a wasteful number, since it uses less digits than its factorization.

18838361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172938.

The product of its digits is 27648, while the sum is 38.

The square root of 18838361 is about 4340.3180759018. The cubic root of 18838361 is about 266.0813110007.

The spelling of 18838361 in words is "eighteen million, eight hundred thirty-eight thousand, three hundred sixty-one".