1213205 has 16 divisors (see below), whose sum is σ = 1762560. Its totient is φ = 782592.

The previous prime is 1213189. The next prime is 1213213. The reversal of 1213205 is 5023121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1213205 - 2⁴ = 1213189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425 + ... + 1614.

It is an arithmetic number, because the mean of its divisors is an integer number (110160).

2^1213205 is an apocalyptic number.

It is an amenable number.

1213205 is a deficient number, since it is larger than the sum of its proper divisors (549355).

1213205 is a wasteful number, since it uses less digits than its factorization.

1213205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1213205 is about 1101.4558547668. The cubic root of 1213205 is about 106.6542248943.

Adding to 1213205 its reverse (5023121), we get a palindrome (6236326).

The spelling of 1213205 in words is "one million, two hundred thirteen thousand, two hundred five".