400089 has 8 divisors (see below), whose sum is σ = 536992. Its totient is φ = 264960.

The previous prime is 400087. The next prime is 400093. The reversal of 400089 is 980004.

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

It is not a de Polignac number, because 400089 - 2¹ = 400087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400087) 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, 234 + ... + 924.

It is an arithmetic number, because the mean of its divisors is an integer number (67124).

2⁴⁰⁰⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

400089 is a deficient number, since it is larger than the sum of its proper divisors (136903).

400089 is a wasteful number, since it uses less digits than its factorization.

400089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 400089 is about 632.5258887982. The cubic root of 400089 is about 73.6860942143.

The spelling of 400089 in words is "four hundred thousand, eighty-nine".