18045252 has 18 divisors (see below), whose sum is σ = 45614478. Its totient is φ = 6015072.

The previous prime is 18045199. The next prime is 18045253. The reversal of 18045252 is 25254081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13660416 + 4384836 = 3696^2 + 2094^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×18045252² = 651262239487008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18045253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 250593 + ... + 250664.

Almost surely, 2^18045252 is an apocalyptic number.

18045252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18045252 is an abundant number, since it is smaller than the sum of its proper divisors (27569226).

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

18045252 is a wasteful number, since it uses less digits than its factorization.

18045252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501267 (or 501262 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 18045252 is about 4247.9703388795. The cubic root of 18045252 is about 262.2935737663.

It can be divided in two parts, 1804 and 5252, that added together give a square (7056 = 84²).

The spelling of 18045252 in words is "eighteen million, forty-five thousand, two hundred fifty-two".