400215 has 8 divisors (see below), whose sum is σ = 640368. Its totient is φ = 213440.

The previous prime is 400207. The next prime is 400217. The reversal of 400215 is 512004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400215 - 2³ = 400207 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 400215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13326 + ... + 13355.

It is an arithmetic number, because the mean of its divisors is an integer number (80046).

2⁴⁰⁰²¹⁵ is an apocalyptic number.

400215 is a deficient number, since it is larger than the sum of its proper divisors (240153).

400215 is a wasteful number, since it uses less digits than its factorization.

400215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26689.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 400215 is about 632.6254816240. The cubic root of 400215 is about 73.6938287212.

Adding to 400215 its reverse (512004), we get a palindrome (912219).

The spelling of 400215 in words is "four hundred thousand, two hundred fifteen".