18078525 has 24 divisors (see below), whose sum is σ = 33212160. Its totient is φ = 9641520.

The previous prime is 18078521. The next prime is 18078527. The reversal of 18078525 is 52587081.

It is not a de Polignac number, because 18078525 - 2² = 18078521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18078525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18078521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12717 + ... + 14066.

It is an arithmetic number, because the mean of its divisors is an integer number (1383840).

Almost surely, 2^18078525 is an apocalyptic number.

18078525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18078525 is a deficient number, since it is larger than the sum of its proper divisors (15133635).

18078525 is a wasteful number, since it uses less digits than its factorization.

18078525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26802 (or 26791 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 18078525 is about 4251.8848761461. The cubic root of 18078525 is about 262.4546860557.

The spelling of 18078525 in words is "eighteen million, seventy-eight thousand, five hundred twenty-five".