406404213 has 32 divisors (see below), whose sum is σ = 567751680. Its totient is φ = 258410880.

The previous prime is 406404209. The next prime is 406404217. The reversal of 406404213 is 312404604.

It is an interprime number because it is at equal distance from previous prime (406404209) and next prime (406404217).

It is not a de Polignac number, because 406404213 - 2² = 406404209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406404217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 917170 + ... + 917612.

It is an arithmetic number, because the mean of its divisors is an integer number (17742240).

Almost surely, 2^406404213 is an apocalyptic number.

It is an amenable number.

406404213 is a deficient number, since it is larger than the sum of its proper divisors (161347467).

406404213 is a wasteful number, since it uses less digits than its factorization.

406404213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 406404213 is about 20159.4695614741. The cubic root of 406404213 is about 740.7177191758.

Adding to 406404213 its reverse (312404604), we get a palindrome (718808817).

The spelling of 406404213 in words is "four hundred six million, four hundred four thousand, two hundred thirteen".