18706946 has 4 divisors (see below), whose sum is σ = 28060422. Its totient is φ = 9353472.

The previous prime is 18706913. The next prime is 18706951. The reversal of 18706946 is 64960781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64960781 = 211 ⋅307871.

It can be written as a sum of positive squares in only one way, i.e., 14250625 + 4456321 = 3775^2 + 2111^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4676735 + ... + 4676738.

Almost surely, 2^18706946 is an apocalyptic number.

18706946 is a deficient number, since it is larger than the sum of its proper divisors (9353476).

18706946 is an equidigital number, since it uses as much as digits as its factorization.

18706946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9353475.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 18706946 is about 4325.1527140669. The cubic root of 18706946 is about 265.4611455608.

The spelling of 18706946 in words is "eighteen million, seven hundred six thousand, nine hundred forty-six".