398131228 has 24 divisors (see below), whose sum is σ = 804780144. Its totient is φ = 170323200.

The previous prime is 398131189. The next prime is 398131229. The reversal of 398131228 is 822131893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398131229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265383 + ... + 266878.

It is an arithmetic number, because the mean of its divisors is an integer number (33532506).

Almost surely, 2^398131228 is an apocalyptic number.

It is an amenable number.

398131228 is an abundant number, since it is smaller than the sum of its proper divisors (406648916).

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

398131228 is a wasteful number, since it uses less digits than its factorization.

398131228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532293 (or 532291 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 398131228 is about 19953.2260048344. The cubic root of 398131228 is about 735.6570723437.

It can be divided in two parts, 39813 and 1228, that added together give a triangular number (41041 = T₂₈₆).

The spelling of 398131228 in words is "three hundred ninety-eight million, one hundred thirty-one thousand, two hundred twenty-eight".