398662188 has 48 divisors (see below), whose sum is σ = 985793760. Its totient is φ = 125171200.

The previous prime is 398662171. The next prime is 398662193. The reversal of 398662188 is 881266893.

It is a self number, because there is not a number n which added to its sum of digits gives 398662188.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298 + ... + 28238.

It is an arithmetic number, because the mean of its divisors is an integer number (20537370).

Almost surely, 2^398662188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398662188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492896880).

398662188 is an abundant number, since it is smaller than the sum of its proper divisors (587131572).

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

398662188 is a wasteful number, since it uses less digits than its factorization.

398662188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28018 (or 28016 counting only the distinct ones).

The product of its digits is 995328, while the sum is 51.

The square root of 398662188 is about 19966.5266884353. The cubic root of 398662188 is about 735.9839586729.

The spelling of 398662188 in words is "three hundred ninety-eight million, six hundred sixty-two thousand, one hundred eighty-eight".