398820212 has 18 divisors (see below), whose sum is σ = 811884402. Its totient is φ = 170922864.

The previous prime is 398820211. The next prime is 398820251. The reversal of 398820212 is 212028893.

It can be written as a sum of positive squares in only one way, i.e., 288864016 + 109956196 = 16996^2 + 10486^2 .

It is a super-2 number, since 2×398820212² = 318115122999449888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398820211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1017203 + ... + 1017594.

It is an arithmetic number, because the mean of its divisors is an integer number (45104689).

Almost surely, 2^398820212 is an apocalyptic number.

It is an amenable number.

398820212 is an abundant number, since it is smaller than the sum of its proper divisors (413064190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398820212 is a wasteful number, since it uses less digits than its factorization.

398820212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034815 (or 2034806 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 398820212 is about 19970.4835194344. The cubic root of 398820212 is about 736.0811903384.

The spelling of 398820212 in words is "three hundred ninety-eight million, eight hundred twenty thousand, two hundred twelve".