1227813 has 4 divisors (see below), whose sum is σ = 1637088. Its totient is φ = 818540.

The previous prime is 1227797. The next prime is 1227829. The reversal of 1227813 is 3187221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3187221 = 3 ⋅1062407.

It is an interprime number because it is at equal distance from previous prime (1227797) and next prime (1227829).

It is a cyclic number.

It is not a de Polignac number, because 1227813 - 2⁴ = 1227797 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1227833) 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, 204633 + ... + 204638.

It is an arithmetic number, because the mean of its divisors is an integer number (409272).

2^1227813 is an apocalyptic number.

It is an amenable number.

1227813 is a deficient number, since it is larger than the sum of its proper divisors (409275).

1227813 is an equidigital number, since it uses as much as digits as its factorization.

1227813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409274.

The product of its digits is 672, while the sum is 24.

The square root of 1227813 is about 1108.0672362271. The cubic root of 1227813 is about 107.0805868002.

The spelling of 1227813 in words is "one million, two hundred twenty-seven thousand, eight hundred thirteen".