1213805 has 16 divisors (see below), whose sum is σ = 1548288. Its totient is φ = 912000.

The previous prime is 1213801. The next prime is 1213829. The reversal of 1213805 is 5083121.

It is not a de Polignac number, because 1213805 - 2² = 1213801 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6260 + ... + 6450.

It is an arithmetic number, because the mean of its divisors is an integer number (96768).

2^1213805 is an apocalyptic number.

It is an amenable number.

1213805 is a deficient number, since it is larger than the sum of its proper divisors (334483).

1213805 is a wasteful number, since it uses less digits than its factorization.

1213805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1213805 is about 1101.7281878939. The cubic root of 1213805 is about 106.6718042230.

Adding to 1213805 its reverse (5083121), we get a palindrome (6296926).

The spelling of 1213805 in words is "one million, two hundred thirteen thousand, eight hundred five".