18966424 has 16 divisors (see below), whose sum is σ = 37654200. Its totient is φ = 8925312.

The previous prime is 18966419. The next prime is 18966439. The reversal of 18966424 is 42466981.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69594 + ... + 69865.

Almost surely, 2^18966424 is an apocalyptic number.

It is an amenable number.

18966424 is a deficient number, since it is larger than the sum of its proper divisors (18687776).

18966424 is a wasteful number, since it uses less digits than its factorization.

18966424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139482 (or 139478 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 18966424 is about 4355.0458091735. The cubic root of 18966424 is about 266.6828892909.

The spelling of 18966424 in words is "eighteen million, nine hundred sixty-six thousand, four hundred twenty-four".