18519345 has 24 divisors (see below), whose sum is σ = 34570536. Its totient is φ = 9116928.

The previous prime is 18519323. The next prime is 18519349. The reversal of 18519345 is 54391581.

It can be written as a sum of positive squares in 4 ways, for example, as 269361 + 18249984 = 519^2 + 4272^2 .

It is not a de Polignac number, because 18519345 - 2⁷ = 18519217 is a prime.

It is a super-2 number, since 2×18519345² = 685932278458050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18519349) 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, 15244 + ... + 16413.

It is an arithmetic number, because the mean of its divisors is an integer number (1440439).

Almost surely, 2^18519345 is an apocalyptic number.

18519345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18519345 is a deficient number, since it is larger than the sum of its proper divisors (16051191).

18519345 is a wasteful number, since it uses less digits than its factorization.

18519345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31681 (or 31678 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 18519345 is about 4303.4108565184. The cubic root of 18519345 is about 264.5707778089.

The spelling of 18519345 in words is "eighteen million, five hundred nineteen thousand, three hundred forty-five".