400406 has 16 divisors (see below), whose sum is σ = 650160. Its totient is φ = 184320.

The previous prime is 400391. The next prime is 400409. The reversal of 400406 is 604004.

It is a happy number.

400406 is nontrivially palindromic in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400409) by changing a digit.

400406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1430 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (40635).

2⁴⁰⁰⁴⁰⁶ is an apocalyptic number.

400406 is a deficient number, since it is larger than the sum of its proper divisors (249754).

400406 is a wasteful number, since it uses less digits than its factorization.

400406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 400406 is about 632.7764218111. The cubic root of 400406 is about 73.7055501565.

The spelling of 400406 in words is "four hundred thousand, four hundred six".