398155 has 4 divisors (see below), whose sum is σ = 477792. Its totient is φ = 318520.

The previous prime is 398149. The next prime is 398171. The reversal of 398155 is 551893.

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

It is not a de Polignac number, because 398155 - 2⁹ = 397643 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39811 + ... + 39820.

It is an arithmetic number, because the mean of its divisors is an integer number (119448).

2³⁹⁸¹⁵⁵ is an apocalyptic number.

398155 is a deficient number, since it is larger than the sum of its proper divisors (79637).

398155 is an equidigital number, since it uses as much as digits as its factorization.

398155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79636.

The product of its digits is 5400, while the sum is 31.

The square root of 398155 is about 630.9952456239. The cubic root of 398155 is about 73.5671713824.

The spelling of 398155 in words is "three hundred ninety-eight thousand, one hundred fifty-five".