18818073 has 24 divisors (see below), whose sum is σ = 27932736. Its totient is φ = 12204000.

The previous prime is 18818069. The next prime is 18818081. The reversal of 18818073 is 37081881.

It is not a de Polignac number, because 18818073 - 2² = 18818069 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18818083) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 82786 + ... + 83012.

It is an arithmetic number, because the mean of its divisors is an integer number (1163864).

Almost surely, 2^18818073 is an apocalyptic number.

It is an amenable number.

18818073 is a deficient number, since it is larger than the sum of its proper divisors (9114663).

18818073 is a wasteful number, since it uses less digits than its factorization.

18818073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 18818073 is about 4337.9802904117. The cubic root of 18818073 is about 265.9857578068.

The spelling of 18818073 in words is "eighteen million, eight hundred eighteen thousand, seventy-three".