1217327920 has 40 divisors (see below), whose sum is σ = 2832675840. Its totient is φ = 486520320.

The previous prime is 1217327911. The next prime is 1217327921. The reversal of 1217327920 is 297237121.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1217327921) 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, 99921 + ... + 111439.

It is an arithmetic number, because the mean of its divisors is an integer number (70816896).

Almost surely, 2^1217327920 is an apocalyptic number.

1217327920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217327920 is an abundant number, since it is smaller than the sum of its proper divisors (1615347920).

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

1217327920 is a wasteful number, since it uses less digits than its factorization.

1217327920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12853 (or 12847 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 1217327920 is about 34890.2267117885. The cubic root of 1217327920 is about 1067.7490514676.

The spelling of 1217327920 in words is "one billion, two hundred seventeen million, three hundred twenty-seven thousand, nine hundred twenty".