218197983 has 8 divisors (see below), whose sum is σ = 291000448. Its totient is φ = 145430424.

The previous prime is 218197961. The next prime is 218197997. The reversal of 218197983 is 389791812.

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

It is not a de Polignac number, because 218197983 - 2⁵ = 218197951 is a prime.

It is a super-2 number, since 2×218197983² = 95220719570536578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218197783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15366 + ... + 25932.

It is an arithmetic number, because the mean of its divisors is an integer number (36375056).

Almost surely, 2^218197983 is an apocalyptic number.

218197983 is a deficient number, since it is larger than the sum of its proper divisors (72802465).

218197983 is a wasteful number, since it uses less digits than its factorization.

218197983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17453.

The product of its digits is 217728, while the sum is 48.

The square root of 218197983 is about 14771.5260890674. The cubic root of 218197983 is about 602.0283050160.

The spelling of 218197983 in words is "two hundred eighteen million, one hundred ninety-seven thousand, nine hundred eighty-three".