1217489472 has 84 divisors (see below), whose sum is σ = 3497273676. Its totient is φ = 404951040.

The previous prime is 1217489393. The next prime is 1217489491. The reversal of 1217489472 is 2749847121.

1217489472 is a `hidden beast` number, since 1 + 2 + 174 + 8 + 9 + 472 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 483296256 + 734193216 = 21984^2 + 27096^2 .

It is a super-2 number, since 2×1217489472² = 2964561228861677568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 298068 + ... + 302124.

Almost surely, 2^1217489472 is an apocalyptic number.

1217489472 is a gapful number since it is divisible by the number (12) 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 1217489472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1748636838).

1217489472 is an abundant number, since it is smaller than the sum of its proper divisors (2279784204).

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

1217489472 is a wasteful number, since it uses less digits than its factorization.

1217489472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4596 (or 4583 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 1217489472 is about 34892.5417818765. The cubic root of 1217489472 is about 1067.7962831575.

The spelling of 1217489472 in words is "one billion, two hundred seventeen million, four hundred eighty-nine thousand, four hundred seventy-two".