214220405 has 24 divisors (see below), whose sum is σ = 299675448. Its totient is φ = 146579328.

The previous prime is 214220401. The next prime is 214220411. The reversal of 214220405 is 504022412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 91431844 + 122788561 = 9562^2 + 11081^2 .

It is not a de Polignac number, because 214220405 - 2² = 214220401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (214220401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214367 + ... + 215363.

It is an arithmetic number, because the mean of its divisors is an integer number (12486477).

Almost surely, 2^214220405 is an apocalyptic number.

It is an amenable number.

214220405 is a deficient number, since it is larger than the sum of its proper divisors (85455043).

214220405 is an equidigital number, since it uses as much as digits as its factorization.

214220405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893 (or 1886 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 214220405 is about 14636.2701874487. The cubic root of 214220405 is about 598.3476807640.

Adding to 214220405 its reverse (504022412), we get a palindrome (718242817).

The spelling of 214220405 in words is "two hundred fourteen million, two hundred twenty thousand, four hundred five".