398465 has 4 divisors (see below), whose sum is σ = 478164. Its totient is φ = 318768.

The previous prime is 398459. The next prime is 398467. The reversal of 398465 is 564893.

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

It can be written as a sum of positive squares in 2 ways, for example, as 303601 + 94864 = 551^2 + 308^2 .

It is a cyclic number.

It is not a de Polignac number, because 398465 - 2¹² = 394369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398465.

It is not an unprimeable number, because it can be changed into a prime (398467) 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, 39842 + ... + 39851.

It is an arithmetic number, because the mean of its divisors is an integer number (119541).

2³⁹⁸⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

398465 is a deficient number, since it is larger than the sum of its proper divisors (79699).

398465 is an equidigital number, since it uses as much as digits as its factorization.

398465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79698.

The product of its digits is 25920, while the sum is 35.

The square root of 398465 is about 631.2408415177. The cubic root of 398465 is about 73.5862593481.

The spelling of 398465 in words is "three hundred ninety-eight thousand, four hundred sixty-five".