1213365 has 16 divisors (see below), whose sum is σ = 2026368. Its totient is φ = 618816.

The previous prime is 1213357. The next prime is 1213367. The reversal of 1213365 is 5633121.

It is not a de Polignac number, because 1213365 - 2³ = 1213357 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 (1213367) 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, 1414 + ... + 2103.

It is an arithmetic number, because the mean of its divisors is an integer number (126648).

2^1213365 is an apocalyptic number.

1213365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213365 is a deficient number, since it is larger than the sum of its proper divisors (813003).

1213365 is a wasteful number, since it uses less digits than its factorization.

1213365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548.

The product of its digits is 540, while the sum is 21.

The square root of 1213365 is about 1101.5284835173. The cubic root of 1213365 is about 106.6589132819.

Adding to 1213365 its reverse (5633121), we get a palindrome (6846486).

It can be divided in two parts, 121 and 3365, that added together give a triangular number (3486 = T₈₃).

The spelling of 1213365 in words is "one million, two hundred thirteen thousand, three hundred sixty-five".