18155252 has 24 divisors (see below), whose sum is σ = 33787656. Its totient is φ = 8506368.

The previous prime is 18155231. The next prime is 18155261. The reversal of 18155252 is 25255181.

It can be written as a sum of positive squares in 4 ways, for example, as 126736 + 18028516 = 356^2 + 4246^2 .

It is a super-2 number, since 2×18155252² = 659226350367008, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 20858 + ... + 21710.

It is an arithmetic number, because the mean of its divisors is an integer number (1407819).

Almost surely, 2^18155252 is an apocalyptic number.

It is an amenable number.

18155252 is a deficient number, since it is larger than the sum of its proper divisors (15632404).

18155252 is a wasteful number, since it uses less digits than its factorization.

18155252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187 (or 1185 counting only the distinct ones).

The product of its digits is 4000, while the sum is 29.

The square root of 18155252 is about 4260.8980274116. The cubic root of 18155252 is about 262.8254563366.

The spelling of 18155252 in words is "eighteen million, one hundred fifty-five thousand, two hundred fifty-two".