401706 has 32 divisors (see below), whose sum is σ = 918720. Its totient is φ = 130032.

The previous prime is 401689. The next prime is 401707. The reversal of 401706 is 607104.

It is a super-2 number, since 2×401706² = 322735420872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (401707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2236 + ... + 2408.

It is an arithmetic number, because the mean of its divisors is an integer number (28710).

2⁴⁰¹⁷⁰⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (459360).

401706 is an abundant number, since it is smaller than the sum of its proper divisors (517014).

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

401706 is a wasteful number, since it uses less digits than its factorization.

401706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 401706 is about 633.8028084507. The cubic root of 401706 is about 73.7852307017.

The spelling of 401706 in words is "four hundred one thousand, seven hundred six".