218138846 has 8 divisors (see below), whose sum is σ = 327333960. Its totient is φ = 109027528.

The previous prime is 218138839. The next prime is 218138861. The reversal of 218138846 is 648831812.

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

It is a super-2 number, since 2×218138846² = 95169112268423432, 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 3 ways as a sum of consecutive naturals, for example, 13976 + ... + 25131.

It is an arithmetic number, because the mean of its divisors is an integer number (40916745).

Almost surely, 2^218138846 is an apocalyptic number.

218138846 is a deficient number, since it is larger than the sum of its proper divisors (109195114).

218138846 is a wasteful number, since it uses less digits than its factorization.

218138846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41898.

The product of its digits is 73728, while the sum is 41.

The square root of 218138846 is about 14769.5242306582. The cubic root of 218138846 is about 601.9739119609.

The spelling of 218138846 in words is "two hundred eighteen million, one hundred thirty-eight thousand, eight hundred forty-six".