18172625 has 8 divisors (see below), whose sum is σ = 22679592. Its totient is φ = 14538000.

The previous prime is 18172621. The next prime is 18172631. The reversal of 18172625 is 52627181.

It can be written as a sum of positive squares in 4 ways, for example, as 2076481 + 16096144 = 1441^2 + 4012^2 .

It is not a de Polignac number, because 18172625 - 2² = 18172621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18172591 and 18172600.

It is not an unprimeable number, because it can be changed into a prime (18172621) 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 7 ways as a sum of consecutive naturals, for example, 72566 + ... + 72815.

It is an arithmetic number, because the mean of its divisors is an integer number (2834949).

Almost surely, 2^18172625 is an apocalyptic number.

It is an amenable number.

18172625 is a deficient number, since it is larger than the sum of its proper divisors (4506967).

18172625 is an equidigital number, since it uses as much as digits as its factorization.

18172625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145396 (or 145386 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 18172625 is about 4262.9361946902. The cubic root of 18172625 is about 262.9092633251.

The spelling of 18172625 in words is "eighteen million, one hundred seventy-two thousand, six hundred twenty-five".