1818087225 has 24 divisors (see below), whose sum is σ = 3102872832. Its totient is φ = 938366400.

The previous prime is 1818087223. The next prime is 1818087269. The reversal of 1818087225 is 5227808181.

It is not a de Polignac number, because 1818087225 - 2¹ = 1818087223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1818087221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 388662 + ... + 393311.

It is an arithmetic number, because the mean of its divisors is an integer number (129286368).

Almost surely, 2^1818087225 is an apocalyptic number.

1818087225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1818087225 is a deficient number, since it is larger than the sum of its proper divisors (1284785607).

1818087225 is a wasteful number, since it uses less digits than its factorization.

1818087225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782017 (or 782012 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 42.

The square root of 1818087225 is about 42639.0340533179. The cubic root of 1818087225 is about 1220.5012777013.

The spelling of 1818087225 in words is "one billion, eight hundred eighteen million, eighty-seven thousand, two hundred twenty-five".