1217741856 has 48 divisors (see below), whose sum is σ = 3203593344. Its totient is φ = 405022464.

The previous prime is 1217741849. The next prime is 1217741857. The reversal of 1217741856 is 6581477121.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (1217741857) 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, 30750 + ... + 58146.

It is an arithmetic number, because the mean of its divisors is an integer number (66741528).

Almost surely, 2^1217741856 is an apocalyptic number.

1217741856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1217741856 is an abundant number, since it is smaller than the sum of its proper divisors (1985851488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1217741856 is a wasteful number, since it uses less digits than its factorization.

1217741856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27873 (or 27865 counting only the distinct ones).

The product of its digits is 94080, while the sum is 42.

The square root of 1217741856 is about 34896.1581839606. The cubic root of 1217741856 is about 1067.8700623245.

The spelling of 1217741856 in words is "one billion, two hundred seventeen million, seven hundred forty-one thousand, eight hundred fifty-six".