398528881 has 4 divisors (see below), whose sum is σ = 399658212. Its totient is φ = 397399552.

The previous prime is 398528869. The next prime is 398528941. The reversal of 398528881 is 188825893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188825893 = 409 ⋅461677.

It can be written as a sum of positive squares in 2 ways, for example, as 218566656 + 179962225 = 14784^2 + 13415^2 .

It is a cyclic number.

It is not a de Polignac number, because 398528881 - 2⁵ = 398528849 is a prime.

It is a super-2 number, since 2×398528881² = 317650537982224322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398528821) 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 3 ways as a sum of consecutive naturals, for example, 564136 + ... + 564841.

It is an arithmetic number, because the mean of its divisors is an integer number (99914553).

Almost surely, 2^398528881 is an apocalyptic number.

It is an amenable number.

398528881 is a deficient number, since it is larger than the sum of its proper divisors (1129331).

398528881 is a wasteful number, since it uses less digits than its factorization.

398528881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129330.

The product of its digits is 1105920, while the sum is 52.

The square root of 398528881 is about 19963.1881471873. The cubic root of 398528881 is about 735.9019153170.

The spelling of 398528881 in words is "three hundred ninety-eight million, five hundred twenty-eight thousand, eight hundred eighty-one".