18551242 has 8 divisors (see below), whose sum is σ = 28786500. Its totient is φ = 8955744.

The previous prime is 18551207. The next prime is 18551251. The reversal of 18551242 is 24215581.

It can be written as a sum of positive squares in 2 ways, for example, as 16966161 + 1585081 = 4119^2 + 1259^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18551242.

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, 159867 + ... + 159982.

Almost surely, 2^18551242 is an apocalyptic number.

18551242 is a deficient number, since it is larger than the sum of its proper divisors (10235258).

18551242 is a wasteful number, since it uses less digits than its factorization.

18551242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319880.

The product of its digits is 3200, while the sum is 28.

The square root of 18551242 is about 4307.1152759126. The cubic root of 18551242 is about 264.7225861606.

The spelling of 18551242 in words is "eighteen million, five hundred fifty-one thousand, two hundred forty-two".