398706 has 32 divisors (see below), whose sum is σ = 995328. Its totient is φ = 103440.

The previous prime is 398693. The next prime is 398711. The reversal of 398706 is 607893.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31 + ... + 893.

It is an arithmetic number, because the mean of its divisors is an integer number (31104).

2³⁹⁸⁷⁰⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497664).

398706 is an abundant number, since it is smaller than the sum of its proper divisors (596622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398706 is a wasteful number, since it uses less digits than its factorization.

398706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 398706 is about 631.4317065210. The cubic root of 398706 is about 73.6010918631.

The spelling of 398706 in words is "three hundred ninety-eight thousand, seven hundred six".