18078385 has 16 divisors (see below), whose sum is σ = 23997456. Its totient is φ = 12987648.

The previous prime is 18078373. The next prime is 18078407. The reversal of 18078385 is 58387081.

It can be written as a sum of positive squares in 8 ways, for example, as 913936 + 17164449 = 956^2 + 4143^2 .

It is a cyclic number.

It is not a de Polignac number, because 18078385 - 2⁷ = 18078257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1354 + ... + 6163.

It is an arithmetic number, because the mean of its divisors is an integer number (1499841).

Almost surely, 2^18078385 is an apocalyptic number.

It is an amenable number.

18078385 is a deficient number, since it is larger than the sum of its proper divisors (5919071).

18078385 is a wasteful number, since it uses less digits than its factorization.

18078385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7572.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 18078385 is about 4251.8684128275. The cubic root of 18078385 is about 262.4540085714.

The spelling of 18078385 in words is "eighteen million, seventy-eight thousand, three hundred eighty-five".