18278345 has 8 divisors (see below), whose sum is σ = 22293960. Its totient is φ = 14382720.

The previous prime is 18278321. The next prime is 18278357. The reversal of 18278345 is 54387281.

It can be written as a sum of positive squares in 4 ways, for example, as 1006009 + 17272336 = 1003^2 + 4156^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-18278345 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18278299 and 18278308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29660 + ... + 30269.

It is an arithmetic number, because the mean of its divisors is an integer number (2786745).

Almost surely, 2^18278345 is an apocalyptic number.

It is an amenable number.

18278345 is a deficient number, since it is larger than the sum of its proper divisors (4015615).

18278345 is an equidigital number, since it uses as much as digits as its factorization.

18278345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59995.

The product of its digits is 53760, while the sum is 38.

The square root of 18278345 is about 4275.3181168189. The cubic root of 18278345 is about 263.4181063747.

The spelling of 18278345 in words is "eighteen million, two hundred seventy-eight thousand, three hundred forty-five".