18047745 has 32 divisors (see below), whose sum is σ = 32841600. Its totient is φ = 9398592.

The previous prime is 18047741. The next prime is 18047747. The reversal of 18047745 is 54774081.

18047745 is a `hidden beast` number, since 180 + 477 + 4 + 5 = 666.

It is not a de Polignac number, because 18047745 - 2² = 18047741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18047741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4251 + ... + 7359.

It is an arithmetic number, because the mean of its divisors is an integer number (1026300).

Almost surely, 2^18047745 is an apocalyptic number.

18047745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18047745 is a deficient number, since it is larger than the sum of its proper divisors (14793855).

18047745 is a wasteful number, since it uses less digits than its factorization.

18047745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166 (or 3160 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 18047745 is about 4248.2637629978. The cubic root of 18047745 is about 262.3056520639.

The spelling of 18047745 in words is "eighteen million, forty-seven thousand, seven hundred forty-five".