400659 has 8 divisors (see below), whose sum is σ = 610560. Its totient is φ = 228936.

The previous prime is 400657. The next prime is 400679. The reversal of 400659 is 956004.

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

It is not a de Polignac number, because 400659 - 2¹ = 400657 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 400659.

It is not an unprimeable number, because it can be changed into a prime (400651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9519 + ... + 9560.

It is an arithmetic number, because the mean of its divisors is an integer number (76320).

2⁴⁰⁰⁶⁵⁹ is an apocalyptic number.

400659 is a deficient number, since it is larger than the sum of its proper divisors (209901).

400659 is a wasteful number, since it uses less digits than its factorization.

400659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19089.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 400659 is about 632.9763028740. The cubic root of 400659 is about 73.7210707182.

The spelling of 400659 in words is "four hundred thousand, six hundred fifty-nine".