398704085 has 16 divisors (see below), whose sum is σ = 518110320. Its totient is φ = 292792320.

The previous prime is 398704013. The next prime is 398704087. The reversal of 398704085 is 580407893.

It can be written as a sum of positive squares in 8 ways, for example, as 40056241 + 358647844 = 6329^2 + 18938^2 .

It is not a de Polignac number, because 398704085 - 2⁸ = 398703829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398704087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5180 + ... + 28709.

It is an arithmetic number, because the mean of its divisors is an integer number (32381895).

Almost surely, 2^398704085 is an apocalyptic number.

It is an amenable number.

398704085 is a deficient number, since it is larger than the sum of its proper divisors (119406235).

398704085 is a wasteful number, since it uses less digits than its factorization.

398704085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34088.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 398704085 is about 19967.5758418492. The cubic root of 398704085 is about 736.0097402667.

The spelling of 398704085 in words is "three hundred ninety-eight million, seven hundred four thousand, eighty-five".