398099855 has 4 divisors (see below), whose sum is σ = 477719832. Its totient is φ = 318479880.

The previous prime is 398099851. The next prime is 398099869. The reversal of 398099855 is 558990893.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 398099855 - 2² = 398099851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398099855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398099851) 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, 39809981 + ... + 39809990.

It is an arithmetic number, because the mean of its divisors is an integer number (119429958).

Almost surely, 2^398099855 is an apocalyptic number.

398099855 is a deficient number, since it is larger than the sum of its proper divisors (79619977).

398099855 is an equidigital number, since it uses as much as digits as its factorization.

398099855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79619976.

The product of its (nonzero) digits is 3499200, while the sum is 56.

The square root of 398099855 is about 19952.4398257456. The cubic root of 398099855 is about 735.6377484174.

The spelling of 398099855 in words is "three hundred ninety-eight million, ninety-nine thousand, eight hundred fifty-five".