212405 has 8 divisors (see below), whose sum is σ = 266112. Its totient is φ = 162448.

The previous prime is 212383. The next prime is 212411. The reversal of 212405 is 504212.

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

It is a cyclic number.

It is not a de Polignac number, because 212405 - 2¹² = 208309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 809 + ... + 1038.

It is an arithmetic number, because the mean of its divisors is an integer number (33264).

2²¹²⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

212405 is a deficient number, since it is larger than the sum of its proper divisors (53707).

212405 is a wasteful number, since it uses less digits than its factorization.

212405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 212405 is about 460.8741693782. The cubic root of 212405 is about 59.6652656510.

Adding to 212405 its reverse (504212), we get a palindrome (716617).

It can be divided in two parts, 21 and 2405, that multiplied together give a palindrome (50505).

The spelling of 212405 in words is "two hundred twelve thousand, four hundred five".