1217828247 has 8 divisors (see below), whose sum is σ = 1648006656. Its totient is φ = 799767672.

The previous prime is 1217828231. The next prime is 1217828309. The reversal of 1217828247 is 7428287121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1217828247 - 2⁴ = 1217828231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1217828199 and 1217828208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217828147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3029223 + ... + 3029624.

It is an arithmetic number, because the mean of its divisors is an integer number (206000832).

Almost surely, 2^1217828247 is an apocalyptic number.

1217828247 is a deficient number, since it is larger than the sum of its proper divisors (430178409).

1217828247 is an equidigital number, since it uses as much as digits as its factorization.

1217828247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6058917.

The product of its digits is 100352, while the sum is 42.

The square root of 1217828247 is about 34897.3959916782. The cubic root of 1217828247 is about 1067.8953145788.

The spelling of 1217828247 in words is "one billion, two hundred seventeen million, eight hundred twenty-eight thousand, two hundred forty-seven".