398105028 has 18 divisors (see below), whose sum is σ = 1006321134. Its totient is φ = 132701664.

The previous prime is 398105027. The next prime is 398105041. The reversal of 398105028 is 820501893.

It can be written as a sum of positive squares in only one way, i.e., 275825664 + 122279364 = 16608^2 + 11058^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×398105028² = 316975226637761568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 11058473 = 398105028 / (3 + 9 + 8 + 1 + 0 + 5 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 398104983 and 398105001.

It is not an unprimeable number, because it can be changed into a prime (398105021) 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, 5529201 + ... + 5529272.

Almost surely, 2^398105028 is an apocalyptic number.

It is an amenable number.

398105028 is an abundant number, since it is smaller than the sum of its proper divisors (608216106).

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

398105028 is a wasteful number, since it uses less digits than its factorization.

398105028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11058483 (or 11058478 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 398105028 is about 19952.5694585935. The cubic root of 398105028 is about 735.6409347516.

The spelling of 398105028 in words is "three hundred ninety-eight million, one hundred five thousand, twenty-eight".