18081552 has 20 divisors (see below), whose sum is σ = 46710800. Its totient is φ = 6027168.

The previous prime is 18081527. The next prime is 18081563. The reversal of 18081552 is 25518081.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 188302 + ... + 188397.

It is an arithmetic number, because the mean of its divisors is an integer number (2335540).

Almost surely, 2^18081552 is an apocalyptic number.

18081552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18081552 is an abundant number, since it is smaller than the sum of its proper divisors (28629248).

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

18081552 is a wasteful number, since it uses less digits than its factorization.

18081552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376710 (or 376704 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 18081552 is about 4252.2408210260. The cubic root of 18081552 is about 262.4693333790.

Subtracting 18081552 from its reverse (25518081), we obtain a square (7436529 = 2727²).

The spelling of 18081552 in words is "eighteen million, eighty-one thousand, five hundred fifty-two".