18015825 has 24 divisors (see below), whose sum is σ = 30132000. Its totient is φ = 9496960.

The previous prime is 18015821. The next prime is 18015863. The reversal of 18015825 is 52851081.

It is not a de Polignac number, because 18015825 - 2² = 18015821 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18015792 and 18015801.

It is not an unprimeable number, because it can be changed into a prime (18015821) 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, 5326 + ... + 8024.

It is an arithmetic number, because the mean of its divisors is an integer number (1255500).

Almost surely, 2^18015825 is an apocalyptic number.

18015825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18015825 is a deficient number, since it is larger than the sum of its proper divisors (12116175).

18015825 is a wasteful number, since it uses less digits than its factorization.

18015825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801 (or 2796 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 18015825 is about 4244.5052715246. The cubic root of 18015825 is about 262.1509192071.

It can be divided in two parts, 1801 and 5825, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 18015825 in words is "eighteen million, fifteen thousand, eight hundred twenty-five".