18385946 has 4 divisors (see below), whose sum is σ = 27578922. Its totient is φ = 9192972.

The previous prime is 18385931. The next prime is 18385951. The reversal of 18385946 is 64958381.

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., 17682025 + 703921 = 4205^2 + 839^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18385897 and 18385906.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4596485 + ... + 4596488.

Almost surely, 2^18385946 is an apocalyptic number.

18385946 is a deficient number, since it is larger than the sum of its proper divisors (9192976).

18385946 is an equidigital number, since it uses as much as digits as its factorization.

18385946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9192975.

The product of its digits is 207360, while the sum is 44.

The square root of 18385946 is about 4287.8836271522. The cubic root of 18385946 is about 263.9339921445.

The spelling of 18385946 in words is "eighteen million, three hundred eighty-five thousand, nine hundred forty-six".