18845145 has 36 divisors (see below), whose sum is σ = 35914788. Its totient is φ = 9134400.

The previous prime is 18845111. The next prime is 18845147. The reversal of 18845145 is 54154881.

It can be written as a sum of positive squares in 2 ways, for example, as 5184729 + 13660416 = 2277^2 + 3696^2 .

It is not a de Polignac number, because 18845145 - 2¹³ = 18836953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18845147) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3715 + ... + 7175.

It is an arithmetic number, because the mean of its divisors is an integer number (997633).

Almost surely, 2^18845145 is an apocalyptic number.

18845145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18845145 is a deficient number, since it is larger than the sum of its proper divisors (17069643).

18845145 is a wasteful number, since it uses less digits than its factorization.

18845145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3494 (or 3480 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 18845145 is about 4341.0995150998. The cubic root of 18845145 is about 266.1132472358.

The spelling of 18845145 in words is "eighteen million, eight hundred forty-five thousand, one hundred forty-five".