398605 has 8 divisors (see below), whose sum is σ = 495000. Its totient is φ = 307776.

The previous prime is 398591. The next prime is 398609. The reversal of 398605 is 506893.

It can be written as a sum of positive squares in 4 ways, for example, as 5476 + 393129 = 74^2 + 627^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398605 - 2⁷ = 398477 is a prime.

398605 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230 + ... + 1519.

It is an arithmetic number, because the mean of its divisors is an integer number (61875).

2³⁹⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

398605 is a deficient number, since it is larger than the sum of its proper divisors (96395).

398605 is a wasteful number, since it uses less digits than its factorization.

398605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 398605 is about 631.3517244769. The cubic root of 398605 is about 73.5948764746.

The spelling of 398605 in words is "three hundred ninety-eight thousand, six hundred five".