1213845 has 8 divisors (see below), whose sum is σ = 1942176. Its totient is φ = 647376.

The previous prime is 1213841. The next prime is 1213873. The reversal of 1213845 is 5483121.

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

It is not a de Polignac number, because 1213845 - 2² = 1213841 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40447 + ... + 40476.

It is an arithmetic number, because the mean of its divisors is an integer number (242772).

2^1213845 is an apocalyptic number.

1213845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213845 is a deficient number, since it is larger than the sum of its proper divisors (728331).

1213845 is an equidigital number, since it uses as much as digits as its factorization.

1213845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80931.

The product of its digits is 960, while the sum is 24.

The square root of 1213845 is about 1101.7463410423. The cubic root of 1213845 is about 106.6729759723.

Adding to 1213845 its reverse (5483121), we get a palindrome (6696966).

The spelling of 1213845 in words is "one million, two hundred thirteen thousand, eight hundred forty-five".