18420286 has 8 divisors (see below), whose sum is σ = 28831824. Its totient is φ = 8809680.

The previous prime is 18420271. The next prime is 18420289. The reversal of 18420286 is 68202481.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420289) 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 3 ways as a sum of consecutive naturals, for example, 200175 + ... + 200266.

It is an arithmetic number, because the mean of its divisors is an integer number (3603978).

Almost surely, 2^18420286 is an apocalyptic number.

18420286 is a deficient number, since it is larger than the sum of its proper divisors (10411538).

18420286 is a wasteful number, since it uses less digits than its factorization.

18420286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400466.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 18420286 is about 4291.8860655893. The cubic root of 18420286 is about 264.0982091759.

It can be divided in two parts, 184 and 20286, that multiplied together give a square (3732624 = 1932²).

The spelling of 18420286 in words is "eighteen million, four hundred twenty thousand, two hundred eighty-six".