1213871 has 8 divisors (see below), whose sum is σ = 1283040. Its totient is φ = 1146112.

The previous prime is 1213841. The next prime is 1213873. The reversal of 1213871 is 1783121.

It is a happy number.

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 1213871 - 2¹⁰ = 1212847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

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 (1213873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1751 + ... + 2343.

It is an arithmetic number, because the mean of its divisors is an integer number (160380).

2^1213871 is an apocalyptic number.

1213871 is a deficient number, since it is larger than the sum of its proper divisors (69169).

1213871 is an equidigital number, since it uses as much as digits as its factorization.

1213871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705.

The product of its digits is 336, while the sum is 23.

The square root of 1213871 is about 1101.7581404283. The cubic root of 1213871 is about 106.6737375955.

Adding to 1213871 its reverse (1783121), we get a palindrome (2996992).

The spelling of 1213871 in words is "one million, two hundred thirteen thousand, eight hundred seventy-one".