398595860 has 48 divisors (see below), whose sum is σ = 907578000. Its totient is φ = 146171904.

The previous prime is 398595859. The next prime is 398595907. The reversal of 398595860 is 68595893.

It can be written as a sum of positive squares in 8 ways, for example, as 26337424 + 372258436 = 5132^2 + 19294^2 .

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 33596 + ... + 43884.

It is an arithmetic number, because the mean of its divisors is an integer number (18907875).

Almost surely, 2^398595860 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 398595860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (453789000).

398595860 is an abundant number, since it is smaller than the sum of its proper divisors (508982140).

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

398595860 is a wasteful number, since it uses less digits than its factorization.

398595860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10460 (or 10458 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 53.

The square root of 398595860 is about 19964.8656394177. The cubic root of 398595860 is about 735.9431396094.

The spelling of 398595860 in words is "three hundred ninety-eight million, five hundred ninety-five thousand, eight hundred sixty".