400219 has 4 divisors (see below), whose sum is σ = 401544. Its totient is φ = 398896.

The previous prime is 400217. The next prime is 400237. The reversal of 400219 is 912004.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 400219 - 2¹ = 400217 is a prime.

It is a super-2 number, since 2×400219² = 320350495922, which contains 22 as substring.

It is a Duffinian number.

400219 is a lucky 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 3 ways as a sum of consecutive naturals, for example, 39 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (100386).

2⁴⁰⁰²¹⁹ is an apocalyptic number.

400219 is a deficient number, since it is larger than the sum of its proper divisors (1325).

400219 is an equidigital number, since it uses as much as digits as its factorization.

400219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 400219 is about 632.6286430442. The cubic root of 400219 is about 73.6940742345.

The spelling of 400219 in words is "four hundred thousand, two hundred nineteen".