18245988 has 36 divisors (see below), whose sum is σ = 47714940. Its totient is φ = 5871936.

The previous prime is 18245987. The next prime is 18245993. The reversal of 18245988 is 88954281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4981824 + 13264164 = 2232^2 + 3642^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×18245988² = 665832156192288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18245987) 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 11 ways as a sum of consecutive naturals, for example, 7695 + ... + 9782.

It is an arithmetic number, because the mean of its divisors is an integer number (1325415).

Almost surely, 2^18245988 is an apocalyptic number.

18245988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18245988 is an abundant number, since it is smaller than the sum of its proper divisors (29468952).

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

18245988 is a wasteful number, since it uses less digits than its factorization.

18245988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17516 (or 17511 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 18245988 is about 4271.5322777664. The cubic root of 18245988 is about 263.2625770838.

The spelling of 18245988 in words is "eighteen million, two hundred forty-five thousand, nine hundred eighty-eight".