18419225 has 18 divisors (see below), whose sum is σ = 25109070. Its totient is φ = 13393600.

The previous prime is 18419221. The next prime is 18419243. The reversal of 18419225 is 52291481.

It can be written as a sum of positive squares in 3 ways, for example, as 203401 + 18215824 = 451^2 + 4268^2 .

It is not a de Polignac number, because 18419225 - 2² = 18419221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18419191 and 18419200.

It is not an unprimeable number, because it can be changed into a prime (18419221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 20 + ... + 6069.

Almost surely, 2^18419225 is an apocalyptic number.

It is an amenable number.

18419225 is a deficient number, since it is larger than the sum of its proper divisors (6689845).

18419225 is a wasteful number, since it uses less digits than its factorization.

18419225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6121 (or 6105 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 18419225 is about 4291.7624584779. The cubic root of 18419225 is about 264.0931384335.

The spelling of 18419225 in words is "eighteen million, four hundred nineteen thousand, two hundred twenty-five".