18506973 has 16 divisors (see below), whose sum is σ = 26176896. Its totient is φ = 11605440.

The previous prime is 18506953. The next prime is 18506977. The reversal of 18506973 is 37960581.

It is not a de Polignac number, because 18506973 - 2⁸ = 18506717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18506977) 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 15 ways as a sum of consecutive naturals, for example, 2011 + ... + 6407.

It is an arithmetic number, because the mean of its divisors is an integer number (1636056).

Almost surely, 2^18506973 is an apocalyptic number.

It is an amenable number.

18506973 is a deficient number, since it is larger than the sum of its proper divisors (7669923).

18506973 is a wasteful number, since it uses less digits than its factorization.

18506973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 18506973 is about 4301.9731519385. The cubic root of 18506973 is about 264.5118484597.

The spelling of 18506973 in words is "eighteen million, five hundred six thousand, nine hundred seventy-three".