18662973 has 20 divisors (see below), whose sum is σ = 29040768. Its totient is φ = 10660440.

The previous prime is 18662971. The next prime is 18662977. The reversal of 18662973 is 37926681.

It is a happy number.

It is not a de Polignac number, because 18662973 - 2¹ = 18662971 is a prime.

It is a super-2 number, since 2×18662973² = 696613122397458, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18662971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5908 + ... + 8498.

Almost surely, 2^18662973 is an apocalyptic number.

It is an amenable number.

18662973 is a deficient number, since it is larger than the sum of its proper divisors (10377795).

18662973 is an frugal number, since it uses more digits than its factorization.

18662973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622 (or 2601 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 18662973 is about 4320.0663189354. The cubic root of 18662973 is about 265.2529825735.

The spelling of 18662973 in words is "eighteen million, six hundred sixty-two thousand, nine hundred seventy-three".