218196649 has 8 divisors (see below), whose sum is σ = 252034848. Its totient is φ = 186692160.

The previous prime is 218196637. The next prime is 218196673. The reversal of 218196649 is 946691812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 218196649 - 2⁵ = 218196617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218196599 and 218196608.

It is not an unprimeable number, because it can be changed into a prime (218196149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583227 + ... + 583600.

It is an arithmetic number, because the mean of its divisors is an integer number (31504356).

Almost surely, 2^218196649 is an apocalyptic number.

It is an amenable number.

218196649 is a deficient number, since it is larger than the sum of its proper divisors (33838199).

218196649 is a wasteful number, since it uses less digits than its factorization.

218196649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166855.

The product of its digits is 186624, while the sum is 46.

The square root of 218196649 is about 14771.4809345576. The cubic root of 218196649 is about 602.0270781373.

The spelling of 218196649 in words is "two hundred eighteen million, one hundred ninety-six thousand, six hundred forty-nine".