400785 has 32 divisors (see below), whose sum is σ = 801792. Its totient is φ = 166080.

The previous prime is 400759. The next prime is 400823. The reversal of 400785 is 587004.

It is not a de Polignac number, because 400785 - 2⁵ = 400753 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 982 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (25056).

2⁴⁰⁰⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

400785 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.

400785 is a wasteful number, since it uses less digits than its factorization.

400785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 400785 is about 633.0758248425. The cubic root of 400785 is about 73.7287978888.

Adding to 400785 its reverse (587004), we get a palindrome (987789).

The spelling of 400785 in words is "four hundred thousand, seven hundred eighty-five".