398690028 has 144 divisors (see below), whose sum is σ = 1149876000. Its totient is φ = 115368960.

The previous prime is 398690021. The next prime is 398690041. The reversal of 398690028 is 820096893.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (398690021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1711000 + ... + 1711232.

It is an arithmetic number, because the mean of its divisors is an integer number (7985250).

Almost surely, 2^398690028 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 398690028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (574938000).

398690028 is an abundant number, since it is smaller than the sum of its proper divisors (751185972).

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

398690028 is a wasteful number, since it uses less digits than its factorization.

398690028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 398690028 is about 19967.2238430885. The cubic root of 398690028 is about 736.0010904009.

The spelling of 398690028 in words is "three hundred ninety-eight million, six hundred ninety thousand, twenty-eight".