18195425 has 6 divisors (see below), whose sum is σ = 22562358. Its totient is φ = 14556320.

The previous prime is 18195421. The next prime is 18195451. The reversal of 18195425 is 52459181.

It can be written as a sum of positive squares in 3 ways, for example, as 2521744 + 15673681 = 1588^2 + 3959^2 .

It is not a de Polignac number, because 18195425 - 2² = 18195421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18195421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363884 + ... + 363933.

It is an arithmetic number, because the mean of its divisors is an integer number (3760393).

Almost surely, 2^18195425 is an apocalyptic number.

It is an amenable number.

18195425 is a deficient number, since it is larger than the sum of its proper divisors (4366933).

18195425 is an equidigital number, since it uses as much as digits as its factorization.

18195425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727827 (or 727822 counting only the distinct ones).

The product of its digits is 14400, while the sum is 35.

The square root of 18195425 is about 4265.6095695692. The cubic root of 18195425 is about 263.0191690404.

The spelling of 18195425 in words is "eighteen million, one hundred ninety-five thousand, four hundred twenty-five".