1217117808 has 120 divisors (see below), whose sum is σ = 3596275280. Its totient is φ = 383201280.

The previous prime is 1217117807. The next prime is 1217117813. The reversal of 1217117808 is 8087117121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217117807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1808160 + ... + 1808832.

Almost surely, 2^1217117808 is an apocalyptic number.

1217117808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1217117808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798137640).

1217117808 is an abundant number, since it is smaller than the sum of its proper divisors (2379157472).

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

1217117808 is a wasteful number, since it uses less digits than its factorization.

1217117808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367 (or 1358 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 36.

The square root of 1217117808 is about 34887.2155380735. The cubic root of 1217117808 is about 1067.6876164196.

It can be divided in two parts, 1217 and 117808, that added together give a square (119025 = 345²).

The spelling of 1217117808 in words is "one billion, two hundred seventeen million, one hundred seventeen thousand, eight hundred eight".