18747645 has 48 divisors (see below), whose sum is σ = 36443520. Its totient is φ = 8190336.

The previous prime is 18747611. The next prime is 18747649. The reversal of 18747645 is 54674781.

It is not a de Polignac number, because 18747645 - 2⁷ = 18747517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18747597 and 18747606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18747649) 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 47 ways as a sum of consecutive naturals, for example, 16351 + ... + 17459.

It is an arithmetic number, because the mean of its divisors is an integer number (759240).

Almost surely, 2^18747645 is an apocalyptic number.

18747645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18747645 is a deficient number, since it is larger than the sum of its proper divisors (17695875).

18747645 is a wasteful number, since it uses less digits than its factorization.

18747645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154 (or 1147 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 18747645 is about 4329.8550784062. The cubic root of 18747645 is about 265.6535193369.

The spelling of 18747645 in words is "eighteen million, seven hundred forty-seven thousand, six hundred forty-five".