398741028 has 72 divisors (see below), whose sum is σ = 1085382144. Its totient is φ = 113601600.

The previous prime is 398741027. The next prime is 398741033. The reversal of 398741028 is 820147893.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (398741027) 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 23 ways as a sum of consecutive naturals, for example, 270333 + ... + 271803.

It is an arithmetic number, because the mean of its divisors is an integer number (15074752).

Almost surely, 2^398741028 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 398741028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (542691072).

398741028 is an abundant number, since it is smaller than the sum of its proper divisors (686641116).

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

398741028 is a wasteful number, since it uses less digits than its factorization.

398741028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953 (or 1944 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 398741028 is about 19968.5008951599. The cubic root of 398741028 is about 736.0324718857.

The spelling of 398741028 in words is "three hundred ninety-eight million, seven hundred forty-one thousand, twenty-eight".