1217725272 has 64 divisors (see below), whose sum is σ = 3387024000. Its totient is φ = 405374112.

The previous prime is 1217725261. The next prime is 1217725273. The reversal of 1217725272 is 2725277121.

It is a happy number.

1217725272 is a `hidden beast` number, since 121 + 7 + 7 + 2 + 527 + 2 = 666.

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 (1217725273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182263 + ... + 188825.

It is an arithmetic number, because the mean of its divisors is an integer number (52922250).

Almost surely, 2^1217725272 is an apocalyptic number.

1217725272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1217725272 is an abundant number, since it is smaller than the sum of its proper divisors (2169298728).

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

1217725272 is a wasteful number, since it uses less digits than its factorization.

1217725272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7437 (or 7427 counting only the distinct ones).

The product of its digits is 27440, while the sum is 36.

The square root of 1217725272 is about 34895.9205638711. The cubic root of 1217725272 is about 1067.8652146530.

The spelling of 1217725272 in words is "one billion, two hundred seventeen million, seven hundred twenty-five thousand, two hundred seventy-two".