398685 has 16 divisors (see below), whose sum is σ = 729216. Its totient is φ = 182208.

The previous prime is 398683. The next prime is 398693. The reversal of 398685 is 586893.

398685 = T₃₃₄ + T₃₃₅ + ... + T₃₄₀.

It is not a de Polignac number, because 398685 - 2¹ = 398683 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398685.

It is not an unprimeable number, because it can be changed into a prime (398681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1794 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (45576).

2³⁹⁸⁶⁸⁵ is an apocalyptic number.

398685 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

398685 is a deficient number, since it is larger than the sum of its proper divisors (330531).

398685 is a wasteful number, since it uses less digits than its factorization.

398685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3812.

The product of its digits is 51840, while the sum is 39.

The square root of 398685 is about 631.4150774253. The cubic root of 398685 is about 73.5997996411.

The spelling of 398685 in words is "three hundred ninety-eight thousand, six hundred eighty-five".