398490855 has 16 divisors (see below), whose sum is σ = 728669184. Its totient is φ = 182167200.

The previous prime is 398490853. The next prime is 398490871. The reversal of 398490855 is 558094893.

It is a happy number.

It is not a de Polignac number, because 398490855 - 2¹ = 398490853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 398490798 and 398490807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398490853) 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 15 ways as a sum of consecutive naturals, for example, 1897471 + ... + 1897680.

It is an arithmetic number, because the mean of its divisors is an integer number (45541824).

Almost surely, 2^398490855 is an apocalyptic number.

398490855 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

398490855 is a deficient number, since it is larger than the sum of its proper divisors (330178329).

398490855 is a wasteful number, since it uses less digits than its factorization.

398490855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3795166.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The square root of 398490855 is about 19962.2357214817. The cubic root of 398490855 is about 735.8785089863.

The spelling of 398490855 in words is "three hundred ninety-eight million, four hundred ninety thousand, eight hundred fifty-five".