398185808 has 20 divisors (see below), whose sum is σ = 784562880. Its totient is φ = 195717984.

The previous prime is 398185807. The next prime is 398185817. The reversal of 398185808 is 808581893.

It is a super-2 number, since 2×398185808² = 317103875385225728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398185807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209960 + ... + 211847.

It is an arithmetic number, because the mean of its divisors is an integer number (39228144).

Almost surely, 2^398185808 is an apocalyptic number.

It is an amenable number.

398185808 is a deficient number, since it is larger than the sum of its proper divisors (386377072).

398185808 is a wasteful number, since it uses less digits than its factorization.

398185808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421874 (or 421868 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The square root of 398185808 is about 19954.5936565995. The cubic root of 398185808 is about 735.6906880006.

The spelling of 398185808 in words is "three hundred ninety-eight million, one hundred eighty-five thousand, eight hundred eight".