18203125 has 16 divisors (see below), whose sum is σ = 22851504. Its totient is φ = 14500000.

The previous prime is 18203123. The next prime is 18203131. The reversal of 18203125 is 52130281.

It can be written as a sum of positive squares in 8 ways, for example, as 11437924 + 6765201 = 3382^2 + 2601^2 .

It is not a de Polignac number, because 18203125 - 2¹ = 18203123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18203096 and 18203105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18203123) by changing a digit.

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, 78009 + ... + 78241.

It is an arithmetic number, because the mean of its divisors is an integer number (1428219).

Almost surely, 2^18203125 is an apocalyptic number.

It is an amenable number.

18203125 is a deficient number, since it is larger than the sum of its proper divisors (4648379).

18203125 is an frugal number, since it uses more digits than its factorization.

18203125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18203125 is about 4266.5120414690. The cubic root of 18203125 is about 263.0562655814.

The spelling of 18203125 in words is "eighteen million, two hundred three thousand, one hundred twenty-five".