400506 has 8 divisors (see below), whose sum is σ = 801024. Its totient is φ = 133500.

The previous prime is 400481. The next prime is 400523. The reversal of 400506 is 605004.

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

400506 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33370 + ... + 33381.

It is an arithmetic number, because the mean of its divisors is an integer number (100128).

2⁴⁰⁰⁵⁰⁶ is an apocalyptic number.

400506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

400506 is a wasteful number, since it uses less digits than its factorization.

400506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66756.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 400506 is about 632.8554337287. The cubic root of 400506 is about 73.7116855470.

The spelling of 400506 in words is "four hundred thousand, five hundred six".