398455 has 4 divisors (see below), whose sum is σ = 478152. Its totient is φ = 318760.

The previous prime is 398441. The next prime is 398459. The reversal of 398455 is 554893.

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

It is not a de Polignac number, because 398455 - 2⁵ = 398423 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 398455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39841 + ... + 39850.

It is an arithmetic number, because the mean of its divisors is an integer number (119538).

2³⁹⁸⁴⁵⁵ is an apocalyptic number.

398455 is a deficient number, since it is larger than the sum of its proper divisors (79697).

398455 is an equidigital number, since it uses as much as digits as its factorization.

398455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79696.

The product of its digits is 21600, while the sum is 34.

The square root of 398455 is about 631.2329205610. The cubic root of 398455 is about 73.5856437618.

The spelling of 398455 in words is "three hundred ninety-eight thousand, four hundred fifty-five".