18225805 has 12 divisors (see below), whose sum is σ = 23683860. Its totient is φ = 13458432.

The previous prime is 18225791. The next prime is 18225811. The reversal of 18225805 is 50852281.

It can be written as a sum of positive squares in 6 ways, for example, as 8874441 + 9351364 = 2979^2 + 3058^2 .

It is not a de Polignac number, because 18225805 - 2⁹ = 18225293 is a prime.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 9940 + ... + 11629.

It is an arithmetic number, because the mean of its divisors is an integer number (1973655).

Almost surely, 2^18225805 is an apocalyptic number.

It is an amenable number.

18225805 is a deficient number, since it is larger than the sum of its proper divisors (5458055).

18225805 is a wasteful number, since it uses less digits than its factorization.

18225805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21600 (or 21587 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 18225805 is about 4269.1691229090. The cubic root of 18225805 is about 263.1654710064.

The spelling of 18225805 in words is "eighteen million, two hundred twenty-five thousand, eight hundred five".