400026 has 48 divisors (see below), whose sum is σ = 957600. Its totient is φ = 110880.

The previous prime is 400009. The next prime is 400031. The reversal of 400026 is 620004.

400026 = T₁₈ + T₁₉ + ... + T₁₃₃.

400026 = 73² + 74² + ... + 116².

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 399984 and 400020.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 400026.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13780 + ... + 13808.

It is an arithmetic number, because the mean of its divisors is an integer number (19950).

2⁴⁰⁰⁰²⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (478800).

400026 is an abundant number, since it is smaller than the sum of its proper divisors (557574).

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

400026 is a wasteful number, since it uses less digits than its factorization.

400026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 400026 is about 632.4760865045. The cubic root of 400026 is about 73.6822263519.

The spelling of 400026 in words is "four hundred thousand, twenty-six".