400010 has 32 divisors (see below), whose sum is σ = 825552. Its totient is φ = 138240.

The previous prime is 400009. The next prime is 400031. The reversal of 400010 is 10004.

It can be written as a sum of positive squares in 8 ways, for example, as 41209 + 358801 = 203^2 + 599^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 399967 and 400003.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2120 + ... + 2300.

2⁴⁰⁰⁰¹⁰ is an apocalyptic number.

400010 is an abundant number, since it is smaller than the sum of its proper divisors (425542).

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

400010 is a wasteful number, since it uses less digits than its factorization.

400010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218.

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 400010 is about 632.4634376784. The cubic root of 400010 is about 73.6812439729.

Adding to 400010 its reverse (10004), we get a palindrome (410014).

The spelling of 400010 in words is "four hundred thousand, ten", and thus it is an iban number.