17998025 has 12 divisors (see below), whose sum is σ = 22571100. Its totient is φ = 14234880.

The previous prime is 17997977. The next prime is 17998027. The reversal of 17998025 is 52089971.

It can be written as a sum of positive squares in 6 ways, for example, as 6512704 + 11485321 = 2552^2 + 3389^2 .

It is not a de Polignac number, because 17998025 - 2¹² = 17993929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17998027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1820 + ... + 6269.

It is an arithmetic number, because the mean of its divisors is an integer number (1880925).

Almost surely, 2^17998025 is an apocalyptic number.

It is an amenable number.

17998025 is a deficient number, since it is larger than the sum of its proper divisors (4573075).

17998025 is an equidigital number, since it uses as much as digits as its factorization.

17998025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8188 (or 8183 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 17998025 is about 4242.4079247522. The cubic root of 17998025 is about 262.0645539513.

The spelling of 17998025 in words is "seventeen million, nine hundred ninety-eight thousand, twenty-five".