821612198 has 16 divisors (see below), whose sum is σ = 1345924944. Its totient is φ = 373052160.

The previous prime is 821612191. The next prime is 821612237. The reversal of 821612198 is 891216128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821612191) 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, 686 + ... + 40542.

It is an arithmetic number, because the mean of its divisors is an integer number (84120309).

Almost surely, 2^821612198 is an apocalyptic number.

821612198 is a deficient number, since it is larger than the sum of its proper divisors (524312746).

821612198 is a wasteful number, since it uses less digits than its factorization.

821612198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40807.

The product of its digits is 13824, while the sum is 38.

The square root of 821612198 is about 28663.7785017956. The cubic root of 821612198 is about 936.6031759725.

The spelling of 821612198 in words is "eight hundred twenty-one million, six hundred twelve thousand, one hundred ninety-eight".