18209745 has 16 divisors (see below), whose sum is σ = 32373120. Its totient is φ = 9711792.

The previous prime is 18209693. The next prime is 18209753. The reversal of 18209745 is 54790281.

It is not a de Polignac number, because 18209745 - 2¹³ = 18201553 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67309 + ... + 67578.

It is an arithmetic number, because the mean of its divisors is an integer number (2023320).

Almost surely, 2^18209745 is an apocalyptic number.

18209745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18209745 is a deficient number, since it is larger than the sum of its proper divisors (14163375).

18209745 is a wasteful number, since it uses less digits than its factorization.

18209745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134901 (or 134895 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 18209745 is about 4267.2877803120. The cubic root of 18209745 is about 263.0881506087.

The spelling of 18209745 in words is "eighteen million, two hundred nine thousand, seven hundred forty-five".