400126 has 4 divisors (see below), whose sum is σ = 600192. Its totient is φ = 200062.

The previous prime is 400123. The next prime is 400151. The reversal of 400126 is 621004.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100030 + ... + 100033.

It is an arithmetic number, because the mean of its divisors is an integer number (150048).

2⁴⁰⁰¹²⁶ is an apocalyptic number.

400126 is a deficient number, since it is larger than the sum of its proper divisors (200066).

400126 is a wasteful number, since it uses less digits than its factorization.

400126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200065.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 400126 is about 632.5551359368. Note that the first 3 decimals coincide. The cubic root of 400126 is about 73.6883656268.

The spelling of 400126 in words is "four hundred thousand, one hundred twenty-six".