400011 has 4 divisors (see below), whose sum is σ = 533352. Its totient is φ = 266672.

The previous prime is 400009. The next prime is 400031. The reversal of 400011 is 110004.

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

It is a cyclic number.

It is not a de Polignac number, because 400011 - 2¹ = 400009 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (400031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66666 + ... + 66671.

It is an arithmetic number, because the mean of its divisors is an integer number (133338).

2⁴⁰⁰⁰¹¹ is an apocalyptic number.

400011 is a deficient number, since it is larger than the sum of its proper divisors (133341).

400011 is a wasteful number, since it uses less digits than its factorization.

400011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133340.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 400011 is about 632.4642282375. The cubic root of 400011 is about 73.6813053724.

Adding to 400011 its reverse (110004), we get a palindrome (510015).

The spelling of 400011 in words is "four hundred thousand, eleven", and thus it is an iban number.