398845 has 4 divisors (see below), whose sum is σ = 478620. Its totient is φ = 319072.

The previous prime is 398833. The next prime is 398857. The reversal of 398845 is 548893.

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

It is an interprime number because it is at equal distance from previous prime (398833) and next prime (398857).

It can be written as a sum of positive squares in 2 ways, for example, as 273529 + 125316 = 523^2 + 354^2 .

It is a cyclic number.

It is not a de Polignac number, because 398845 - 2⁵ = 398813 is a prime.

It is a d-powerful number, because it can be written as 3 + 9 + 8⁴ + 8⁴ + 4² + 5⁸ .

It is a congruent 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, 39880 + ... + 39889.

It is an arithmetic number, because the mean of its divisors is an integer number (119655).

2³⁹⁸⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

398845 is a deficient number, since it is larger than the sum of its proper divisors (79775).

398845 is an equidigital number, since it uses as much as digits as its factorization.

398845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79774.

The product of its digits is 34560, while the sum is 37.

The square root of 398845 is about 631.5417642563. The cubic root of 398845 is about 73.6096439986.

The spelling of 398845 in words is "three hundred ninety-eight thousand, eight hundred forty-five".