18864946 has 4 divisors (see below), whose sum is σ = 28297422. Its totient is φ = 9432472.

The previous prime is 18864887. The next prime is 18864959. The reversal of 18864946 is 64946881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64946881 = 7753 ⋅8377.

It can be written as a sum of positive squares in only one way, i.e., 18826921 + 38025 = 4339^2 + 195^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18864896 and 18864905.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4716235 + ... + 4716238.

Almost surely, 2^18864946 is an apocalyptic number.

18864946 is a deficient number, since it is larger than the sum of its proper divisors (9432476).

18864946 is an equidigital number, since it uses as much as digits as its factorization.

18864946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9432475.

The product of its digits is 331776, while the sum is 46.

The square root of 18864946 is about 4343.3795597438. The cubic root of 18864946 is about 266.2064182525.

The spelling of 18864946 in words is "eighteen million, eight hundred sixty-four thousand, nine hundred forty-six".