18890225 has 12 divisors (see below), whose sum is σ = 23515980. Its totient is φ = 15052800.

The previous prime is 18890203. The next prime is 18890257. The reversal of 18890225 is 52209881.

It can be written as a sum of positive squares in 6 ways, for example, as 2211169 + 16679056 = 1487^2 + 4084^2 .

It is not a de Polignac number, because 18890225 - 2¹⁰ = 18889201 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5681 + ... + 8369.

It is an arithmetic number, because the mean of its divisors is an integer number (1959665).

Almost surely, 2^18890225 is an apocalyptic number.

It is an amenable number.

18890225 is a deficient number, since it is larger than the sum of its proper divisors (4625755).

18890225 is a wasteful number, since it uses less digits than its factorization.

18890225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980 (or 2975 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18890225 is about 4346.2886466502. The cubic root of 18890225 is about 266.3252705845.

The spelling of 18890225 in words is "eighteen million, eight hundred ninety thousand, two hundred twenty-five".