1213847 has 4 divisors (see below), whose sum is σ = 1242120. Its totient is φ = 1185576.

The previous prime is 1213841. The next prime is 1213873. The reversal of 1213847 is 7483121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7483121 = 31 ⋅241391.

It is a cyclic number.

It is not a de Polignac number, because 1213847 - 2⁸ = 1213591 is a prime.

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 (1213841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14072 + ... + 14157.

It is an arithmetic number, because the mean of its divisors is an integer number (310530).

2^1213847 is an apocalyptic number.

1213847 is a deficient number, since it is larger than the sum of its proper divisors (28273).

1213847 is an equidigital number, since it uses as much as digits as its factorization.

1213847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28272.

The product of its digits is 1344, while the sum is 26.

The square root of 1213847 is about 1101.7472486918. The cubic root of 1213847 is about 106.6730345591.

Adding to 1213847 its reverse (7483121), we get a palindrome (8696968).

The spelling of 1213847 in words is "one million, two hundred thirteen thousand, eight hundred forty-seven".