25530018 has 16 divisors (see below), whose sum is σ = 51321600. Its totient is φ = 8466416.

The previous prime is 25530013. The next prime is 25530061. The reversal of 25530018 is 81003552.

It is a self number, because there is not a number n which added to its sum of digits gives 25530018.

It is not an unprimeable number, because it can be changed into a prime (25530013) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9618 + ... + 11981.

It is an arithmetic number, because the mean of its divisors is an integer number (3207600).

Almost surely, 2^25530018 is an apocalyptic number.

25530018 is an abundant number, since it is smaller than the sum of its proper divisors (25791582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25530018 is a wasteful number, since it uses less digits than its factorization.

25530018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21801.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 25530018 is about 5052.7238198817. The cubic root of 25530018 is about 294.4537165810.

The spelling of 25530018 in words is "twenty-five million, five hundred thirty thousand, eighteen".