18704997 has 12 divisors (see below), whose sum is σ = 27890304. Its totient is φ = 12067560.

The previous prime is 18704989. The next prime is 18705019. The reversal of 18704997 is 79940781.

It is not a de Polignac number, because 18704997 - 2³ = 18704989 is a prime.

It is a super-3 number, since 3×18704997³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18704927) 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 11 ways as a sum of consecutive naturals, for example, 33243 + ... + 33800.

It is an arithmetic number, because the mean of its divisors is an integer number (2324192).

Almost surely, 2^18704997 is an apocalyptic number.

It is an amenable number.

18704997 is a deficient number, since it is larger than the sum of its proper divisors (9185307).

18704997 is a wasteful number, since it uses less digits than its factorization.

18704997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67080 (or 67077 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 18704997 is about 4324.9273982346. The cubic root of 18704997 is about 265.4519261379.

It can be divided in two parts, 18704 and 997, that added together give a triangular number (19701 = T₁₉₈).

The spelling of 18704997 in words is "eighteen million, seven hundred four thousand, nine hundred ninety-seven".