1228712843 has 4 divisors (see below), whose sum is σ = 1293381960. Its totient is φ = 1164043728.

The previous prime is 1228712801. The next prime is 1228712867. The reversal of 1228712843 is 3482178221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3482178221 = 17 ⋅204834013.

It is a cyclic number.

It is not a de Polignac number, because 1228712843 - 2¹⁴ = 1228696459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1228712797 and 1228712806.

It is not an unprimeable number, because it can be changed into a prime (1228712873) 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, 32334530 + ... + 32334567.

It is an arithmetic number, because the mean of its divisors is an integer number (323345490).

Almost surely, 2^1228712843 is an apocalyptic number.

1228712843 is a deficient number, since it is larger than the sum of its proper divisors (64669117).

1228712843 is an equidigital number, since it uses as much as digits as its factorization.

1228712843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64669116.

The product of its digits is 43008, while the sum is 38.

The square root of 1228712843 is about 35053.0004849799. Note that the first 3 decimals coincide. The cubic root of 1228712843 is about 1071.0673958489.

The spelling of 1228712843 in words is "one billion, two hundred twenty-eight million, seven hundred twelve thousand, eight hundred forty-three".