398218222 has 4 divisors (see below), whose sum is σ = 597327336. Its totient is φ = 199109110.

The previous prime is 398218213. The next prime is 398218229. The reversal of 398218222 is 222812893.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398218229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99554554 + ... + 99554557.

It is an arithmetic number, because the mean of its divisors is an integer number (149331834).

Almost surely, 2^398218222 is an apocalyptic number.

398218222 is a deficient number, since it is larger than the sum of its proper divisors (199109114).

398218222 is a wasteful number, since it uses less digits than its factorization.

398218222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199109113.

The product of its digits is 27648, while the sum is 37.

The square root of 398218222 is about 19955.4058340090. The cubic root of 398218222 is about 735.7106502314.

The spelling of 398218222 in words is "three hundred ninety-eight million, two hundred eighteen thousand, two hundred twenty-two".