18238834 has 4 divisors (see below), whose sum is σ = 27358254. Its totient is φ = 9119416.

The previous prime is 18238811. The next prime is 18238849. The reversal of 18238834 is 43883281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16834609 + 1404225 = 4103^2 + 1185^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18238793 and 18238802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4559707 + ... + 4559710.

Almost surely, 2^18238834 is an apocalyptic number.

18238834 is a deficient number, since it is larger than the sum of its proper divisors (9119420).

18238834 is an equidigital number, since it uses as much as digits as its factorization.

18238834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9119419.

The product of its digits is 36864, while the sum is 37.

The square root of 18238834 is about 4270.6947912488. The cubic root of 18238834 is about 263.2281653786.

The spelling of 18238834 in words is "eighteen million, two hundred thirty-eight thousand, eight hundred thirty-four".