1228406827 has 4 divisors (see below), whose sum is σ = 1228477680. Its totient is φ = 1228335976.

The previous prime is 1228406821. The next prime is 1228406831. The reversal of 1228406827 is 7286048221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7286048221 = 349 ⋅20876929.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228406827 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228406827.

It is not an unprimeable number, because it can be changed into a prime (1228406821) 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, 9978 + ... + 50560.

It is an arithmetic number, because the mean of its divisors is an integer number (307119420).

Almost surely, 2^1228406827 is an apocalyptic number.

1228406827 is a deficient number, since it is larger than the sum of its proper divisors (70853).

1228406827 is an equidigital number, since it uses as much as digits as its factorization.

1228406827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70852.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 1228406827 is about 35048.6351660090. The cubic root of 1228406827 is about 1070.9784705489.

The spelling of 1228406827 in words is "one billion, two hundred twenty-eight million, four hundred six thousand, eight hundred twenty-seven".