218900649 has 8 divisors (see below), whose sum is σ = 318400992. Its totient is φ = 132667040.

The previous prime is 218900611. The next prime is 218900651. The reversal of 218900649 is 946009812.

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

It is not a de Polignac number, because 218900649 - 2²⁰ = 217852073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218900699) 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 7 ways as a sum of consecutive naturals, for example, 3316644 + ... + 3316709.

It is an arithmetic number, because the mean of its divisors is an integer number (39800124).

Almost surely, 2^218900649 is an apocalyptic number.

It is an amenable number.

218900649 is a deficient number, since it is larger than the sum of its proper divisors (99500343).

218900649 is a wasteful number, since it uses less digits than its factorization.

218900649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633367.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 218900649 is about 14795.2914469435. The cubic root of 218900649 is about 602.6738525976.

The spelling of 218900649 in words is "two hundred eighteen million, nine hundred thousand, six hundred forty-nine".