1213447 has 4 divisors (see below), whose sum is σ = 1255320. Its totient is φ = 1171576.

The previous prime is 1213439. The next prime is 1213451. The reversal of 1213447 is 7443121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7443121 = 7 ⋅1063303.

It is a cyclic number.

It is not a de Polignac number, because 1213447 - 2³ = 1213439 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 (1213427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20893 + ... + 20950.

It is an arithmetic number, because the mean of its divisors is an integer number (313830).

2^1213447 is an apocalyptic number.

1213447 is a deficient number, since it is larger than the sum of its proper divisors (41873).

1213447 is an equidigital number, since it uses as much as digits as its factorization.

1213447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41872.

The product of its digits is 672, while the sum is 22.

The square root of 1213447 is about 1101.5657038960. The cubic root of 1213447 is about 106.6613159208.

Adding to 1213447 its reverse (7443121), we get a palindrome (8656568).

The spelling of 1213447 in words is "one million, two hundred thirteen thousand, four hundred forty-seven".