18946 has 4 divisors (see below), whose sum is σ = 28422. Its totient is φ = 9472.

The previous prime is 18919. The next prime is 18947. The reversal of 18946 is 64981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64981 = 7 ⋅9283.

It can be written as a sum of positive squares in only one way, i.e., 11025 + 7921 = 105^2 + 89^2 .

It is a d-powerful number, because it can be written as 1 + 8³ + 9⁴ + 4⁶ + 6⁵ .

It is not an unprimeable number, because it can be changed into a prime (18947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4735 + ... + 4738.

2¹⁸⁹⁴⁶ is an apocalyptic number.

18946 is a deficient number, since it is larger than the sum of its proper divisors (9476).

18946 is an equidigital number, since it uses as much as digits as its factorization.

18946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9475.

The product of its digits is 1728, while the sum is 28.

The square root of 18946 is about 137.6444695584. The cubic root of 18946 is about 26.6587129057.

The spelling of 18946 in words is "eighteen thousand, nine hundred forty-six".