398345 has 4 divisors (see below), whose sum is σ = 478020. Its totient is φ = 318672.

The previous prime is 398341. The next prime is 398347. The reversal of 398345 is 543893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543893 = 7 ⋅77699.

It can be written as a sum of positive squares in 2 ways, for example, as 175561 + 222784 = 419^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 398345 - 2² = 398341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398341) 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, 39830 + ... + 39839.

It is an arithmetic number, because the mean of its divisors is an integer number (119505).

2³⁹⁸³⁴⁵ is an apocalyptic number.

It is an amenable number.

398345 is a deficient number, since it is larger than the sum of its proper divisors (79675).

398345 is an equidigital number, since it uses as much as digits as its factorization.

398345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79674.

The product of its digits is 12960, while the sum is 32.

The square root of 398345 is about 631.1457834764. The cubic root of 398345 is about 73.5788716330.

The spelling of 398345 in words is "three hundred ninety-eight thousand, three hundred forty-five".